74721481 has 4 divisors (see below), whose sum is σ = 75197572. Its totient is φ = 74245392.

The previous prime is 74721461. The next prime is 74721529. The reversal of 74721481 is 18412747.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18412747 = 2237 ⋅8231.

It can be written as a sum of positive squares in 2 ways, for example, as 10465225 + 64256256 = 3235^2 + 8016^2 .

It is a cyclic number.

It is not a de Polignac number, because 74721481 - 2²¹ = 72624329 is a prime.

It is a super-2 number, since 2×74721481² = 11166599445666722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74721431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237810 + ... + 238123.

It is an arithmetic number, because the mean of its divisors is an integer number (18799393).

Almost surely, 2^74721481 is an apocalyptic number.

It is an amenable number.

74721481 is a deficient number, since it is larger than the sum of its proper divisors (476091).

74721481 is a wasteful number, since it uses less digits than its factorization.

74721481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476090.

The product of its digits is 12544, while the sum is 34.

The square root of 74721481 is about 8644.1587791988. The cubic root of 74721481 is about 421.1936584006.

The spelling of 74721481 in words is "seventy-four million, seven hundred twenty-one thousand, four hundred eighty-one".