74928821 has 8 divisors (see below), whose sum is σ = 81857088. Its totient is φ = 68020000.

The previous prime is 74928817. The next prime is 74928823. The reversal of 74928821 is 12882947.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 74928821 - 2² = 74928817 is a prime.

It is a super-2 number, since 2×74928821² = 11228656432900082, 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 (74928823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3896 + ... + 12846.

It is an arithmetic number, because the mean of its divisors is an integer number (10232136).

Almost surely, 2^74928821 is an apocalyptic number.

It is an amenable number.

74928821 is a deficient number, since it is larger than the sum of its proper divisors (6928267).

74928821 is a wasteful number, since it uses less digits than its factorization.

74928821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9723.

The product of its digits is 64512, while the sum is 41.

The square root of 74928821 is about 8656.1435408616. The cubic root of 74928821 is about 421.5828799937.

The spelling of 74928821 in words is "seventy-four million, nine hundred twenty-eight thousand, eight hundred twenty-one".