742498681 has 4 divisors (see below), whose sum is σ = 786175092. Its totient is φ = 698822272.

The previous prime is 742498667. The next prime is 742498697. The reversal of 742498681 is 186894247.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186894247 = 823 ⋅227089.

It can be written as a sum of positive squares in 2 ways, for example, as 411440656 + 331058025 = 20284^2 + 18195^2 .

It is a cyclic number.

It is not a de Polignac number, because 742498681 - 2⁷ = 742498553 is a prime.

It is a super-2 number, since 2×742498681² = 1102608582573479522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (742498481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21838180 + ... + 21838213.

It is an arithmetic number, because the mean of its divisors is an integer number (196543773).

Almost surely, 2^742498681 is an apocalyptic number.

It is an amenable number.

742498681 is a deficient number, since it is larger than the sum of its proper divisors (43676411).

742498681 is a wasteful number, since it uses less digits than its factorization.

742498681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43676410.

The product of its digits is 774144, while the sum is 49.

The square root of 742498681 is about 27248.8289840132. The cubic root of 742498681 is about 905.5210743205.

The spelling of 742498681 in words is "seven hundred forty-two million, four hundred ninety-eight thousand, six hundred eighty-one".