79443840 has 256 divisors, whose sum is σ = 303160320. Its totient is φ = 17301504.

The previous prime is 79443829. The next prime is 79443841. The reversal of 79443840 is 4834497.

It is a super-2 number, since 2×79443840² = 12622647427891200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79443841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 308992 + ... + 309248.

It is an arithmetic number, because the mean of its divisors is an integer number (1184220).

Almost surely, 2^79443840 is an apocalyptic number.

79443840 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 79443840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151580160).

79443840 is an abundant number, since it is smaller than the sum of its proper divisors (223716480).

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

79443840 is a wasteful number, since it uses less digits than its factorization.

79443840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 297 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 79443840 is about 8913.1273972720. The cubic root of 79443840 is about 429.8861064863.

The spelling of 79443840 in words is "seventy-nine million, four hundred forty-three thousand, eight hundred forty".