74555720 has 16 divisors (see below), whose sum is σ = 167750460. Its totient is φ = 29822272.

The previous prime is 74555717. The next prime is 74555729. The reversal of 74555720 is 2755547.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 72556324 + 1999396 = 8518^2 + 1414^2 .

It is not an unprimeable number, because it can be changed into a prime (74555729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 931907 + ... + 931986.

Almost surely, 2^74555720 is an apocalyptic number.

It is an amenable number.

74555720 is an abundant number, since it is smaller than the sum of its proper divisors (93194740).

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

74555720 is a wasteful number, since it uses less digits than its factorization.

74555720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863904 (or 1863900 counting only the distinct ones).

The product of its (nonzero) digits is 49000, while the sum is 35.

The square root of 74555720 is about 8634.5654204482. The cubic root of 74555720 is about 420.8819712652.

It can be divided in two parts, 745 and 55720, that added together give a palindrome (56465).

The spelling of 74555720 in words is "seventy-four million, five hundred fifty-five thousand, seven hundred twenty".