74784640 has 64 divisors (see below), whose sum is σ = 204334560. Its totient is φ = 25638912.

The previous prime is 74784637. The next prime is 74784673. The reversal of 74784640 is 4648747.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 74784593 and 74784602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3867 + ... + 12826.

Almost surely, 2^74784640 is an apocalyptic number.

74784640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

74784640 is an abundant number, since it is smaller than the sum of its proper divisors (129549920).

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

74784640 is a wasteful number, since it uses less digits than its factorization.

74784640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16719 (or 16707 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 40.

The square root of 74784640 is about 8647.8112837874. The cubic root of 74784640 is about 421.3122975486.

The spelling of 74784640 in words is "seventy-four million, seven hundred eighty-four thousand, six hundred forty".