74855520 has 144 divisors (see below), whose sum is σ = 257690160. Its totient is φ = 19786752.

The previous prime is 74855519. The next prime is 74855533. The reversal of 74855520 is 2555847.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 326766 + ... + 326994.

It is an arithmetic number, because the mean of its divisors is an integer number (1789515).

Almost surely, 2^74855520 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 74855520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128845080).

74855520 is an abundant number, since it is smaller than the sum of its proper divisors (182834640).

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

74855520 is a wasteful number, since it uses less digits than its factorization.

74855520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477 (or 466 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 36.

The square root of 74855520 is about 8651.9084599873. The cubic root of 74855520 is about 421.4453604616.

The spelling of 74855520 in words is "seventy-four million, eight hundred fifty-five thousand, five hundred twenty".