74774640 has 40 divisors (see below), whose sum is σ = 231802128. Its totient is φ = 19939840.

The previous prime is 74774629. The next prime is 74774641. The reversal of 74774640 is 4647747.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74774641) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 155541 + ... + 156020.

Almost surely, 2^74774640 is an apocalyptic number.

It is an amenable number.

74774640 is an abundant number, since it is smaller than the sum of its proper divisors (157027488).

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

74774640 is a wasteful number, since it uses less digits than its factorization.

74774640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311577 (or 311571 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 39.

The square root of 74774640 is about 8647.2330834782. The cubic root of 74774640 is about 421.2935177975.

The spelling of 74774640 in words is "seventy-four million, seven hundred seventy-four thousand, six hundred forty".