79155440 has 160 divisors (see below), whose sum is σ = 230985216. Its totient is φ = 24560640.

The previous prime is 79155437. The next prime is 79155457. The reversal of 79155440 is 4455197.

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 79155440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 604175 + ... + 604305.

Almost surely, 2^79155440 is an apocalyptic number.

79155440 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 79155440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115492608).

79155440 is an abundant number, since it is smaller than the sum of its proper divisors (151829776).

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

79155440 is a wasteful number, since it uses less digits than its factorization.

79155440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 79155440 is about 8896.9343034553. The cubic root of 79155440 is about 429.3652795264.

The spelling of 79155440 in words is "seventy-nine million, one hundred fifty-five thousand, four hundred forty".