74658640 has 40 divisors (see below), whose sum is σ = 198380160. Its totient is φ = 25597056.

The previous prime is 74658589. The next prime is 74658671. The reversal of 74658640 is 4685647.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

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 = 74658593 and 74658602.

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, 66100 + ... + 67219.

It is an arithmetic number, because the mean of its divisors is an integer number (4959504).

Almost surely, 2^74658640 is an apocalyptic number.

74658640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

74658640 is an abundant number, since it is smaller than the sum of its proper divisors (123721520).

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

74658640 is a wasteful number, since it uses less digits than its factorization.

74658640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133339 (or 133333 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 74658640 is about 8640.5231323109. The cubic root of 74658640 is about 421.0755502218.

The spelling of 74658640 in words is "seventy-four million, six hundred fifty-eight thousand, six hundred forty".