74490781 has 4 divisors (see below), whose sum is σ = 74564064. Its totient is φ = 74417500.

The previous prime is 74490769. The next prime is 74490791. The reversal of 74490781 is 18709447.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 74490781 - 2⁷ = 74490653 is a prime.

It is a super-2 number, since 2×74490781² = 11097752907979922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74490701) 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, 35095 + ... + 37156.

It is an arithmetic number, because the mean of its divisors is an integer number (18641016).

Almost surely, 2^74490781 is an apocalyptic number.

It is an amenable number.

74490781 is a deficient number, since it is larger than the sum of its proper divisors (73283).

74490781 is a wasteful number, since it uses less digits than its factorization.

74490781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73282.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 74490781 is about 8630.8041919626. The cubic root of 74490781 is about 420.7597378825.

The spelling of 74490781 in words is "seventy-four million, four hundred ninety thousand, seven hundred eighty-one".