79533440 has 128 divisors (see below), whose sum is σ = 223110720. Its totient is φ = 26542080.

The previous prime is 79533439. The next prime is 79533451. The reversal of 79533440 is 4433597.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 79533440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183464 + ... + 183896.

Almost surely, 2^79533440 is an apocalyptic number.

79533440 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79533440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111555360).

79533440 is an abundant number, since it is smaller than the sum of its proper divisors (143577280).

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

79533440 is a wasteful number, since it uses less digits than its factorization.

79533440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500 (or 488 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 79533440 is about 8918.1522749951. The cubic root of 79533440 is about 430.0476601220.

The spelling of 79533440 in words is "seventy-nine million, five hundred thirty-three thousand, four hundred forty".