74921520 has 80 divisors (see below), whose sum is σ = 234127872. Its totient is φ = 19818240.

The previous prime is 74921461. The next prime is 74921537. The reversal of 74921520 is 2512947.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×74921520² = 11226468318220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 30249 + ... + 32631.

Almost surely, 2^74921520 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 74921520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117063936).

74921520 is an abundant number, since it is smaller than the sum of its proper divisors (159206352).

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

74921520 is a wasteful number, since it uses less digits than its factorization.

74921520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2530 (or 2524 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 74921520 is about 8655.7218069899. The cubic root of 74921520 is about 421.5691866576.

The spelling of 74921520 in words is "seventy-four million, nine hundred twenty-one thousand, five hundred twenty".