74921856 has 128 divisors (see below), whose sum is σ = 220320000. Its totient is φ = 22437888.

The previous prime is 74921843. The next prime is 74921881. The reversal of 74921856 is 65812947.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×74921856² = 11226569012969472, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 149895 + ... + 150393.

It is an arithmetic number, because the mean of its divisors is an integer number (1721250).

Almost surely, 2^74921856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 74921856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110160000).

74921856 is an abundant number, since it is smaller than the sum of its proper divisors (145398144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

74921856 is a wasteful number, since it uses less digits than its factorization.

74921856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556 (or 544 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The square root of 74921856 is about 8655.7412160947. The cubic root of 74921856 is about 421.5698168594.

The spelling of 74921856 in words is "seventy-four million, nine hundred twenty-one thousand, eight hundred fifty-six".