79874640 has 80 divisors (see below), whose sum is σ = 275131200. Its totient is φ = 21299328.

The previous prime is 79874617. The next prime is 79874647. The reversal of 79874640 is 4647897.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79874647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16330 + ... + 20649.

It is an arithmetic number, because the mean of its divisors is an integer number (3439140).

Almost surely, 2^79874640 is an apocalyptic number.

It is an amenable number.

79874640 is an abundant number, since it is smaller than the sum of its proper divisors (195256560).

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

79874640 is a wasteful number, since it uses less digits than its factorization.

79874640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37001 (or 36989 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 79874640 is about 8937.2613254844. The cubic root of 79874640 is about 430.6617537335.

The spelling of 79874640 in words is "seventy-nine million, eight hundred seventy-four thousand, six hundred forty".