74478640 has 40 divisors (see below), whose sum is σ = 173926368. Its totient is φ = 29660160.

The previous prime is 74478631. The next prime is 74478653. The reversal of 74478640 is 4687447.

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 = 74478593 and 74478602.

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, 17349 + ... + 21211.

Almost surely, 2^74478640 is an apocalyptic number.

It is an amenable number.

74478640 is an abundant number, since it is smaller than the sum of its proper divisors (99447728).

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

74478640 is a wasteful number, since it uses less digits than its factorization.

74478640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4117 (or 4111 counting only the distinct ones).

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

The square root of 74478640 is about 8630.1008105352. The cubic root of 74478640 is about 420.7368772391.

The spelling of 74478640 in words is "seventy-four million, four hundred seventy-eight thousand, six hundred forty".