79997400 has 216 divisors, whose sum is σ = 312865020. Its totient is φ = 18264960.

The previous prime is 79997387. The next prime is 79997447. The reversal of 79997400 is 479997.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 87747 + ... + 88653.

Almost surely, 2^79997400 is an apocalyptic number.

79997400 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 79997400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156432510).

79997400 is an abundant number, since it is smaller than the sum of its proper divisors (232867620).

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

79997400 is a wasteful number, since it uses less digits than its factorization.

79997400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943 (or 924 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The square root of 79997400 is about 8944.1265643997. The cubic root of 79997400 is about 430.8822700140.

The spelling of 79997400 in words is "seventy-nine million, nine hundred ninety-seven thousand, four hundred".