74447681 has 32 divisors (see below), whose sum is σ = 98641920. Its totient is φ = 54432000.

The previous prime is 74447657. The next prime is 74447687. The reversal of 74447681 is 18674447.

It is a de Polignac number, because none of the positive numbers 2^k-74447681 is a prime.

It is a super-2 number, since 2×74447681² = 11084914412555522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (74447687) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 220745 + ... + 221081.

It is an arithmetic number, because the mean of its divisors is an integer number (3082560).

Almost surely, 2^74447681 is an apocalyptic number.

It is an amenable number.

74447681 is a deficient number, since it is larger than the sum of its proper divisors (24194239).

74447681 is a wasteful number, since it uses less digits than its factorization.

74447681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525.

The product of its digits is 150528, while the sum is 41.

The square root of 74447681 is about 8628.3069602327. The cubic root of 74447681 is about 420.6785723873.

The spelling of 74447681 in words is "seventy-four million, four hundred forty-seven thousand, six hundred eighty-one".