79997540 has 48 divisors (see below), whose sum is σ = 192872064. Its totient is φ = 27302400.

The previous prime is 79997527. The next prime is 79997551. The reversal of 79997540 is 4579997.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32555 + ... + 34925.

It is an arithmetic number, because the mean of its divisors is an integer number (4018168).

Almost surely, 2^79997540 is an apocalyptic number.

79997540 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 79997540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96436032).

79997540 is an abundant number, since it is smaller than the sum of its proper divisors (112874524).

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

79997540 is a wasteful number, since it uses less digits than its factorization.

79997540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2628 (or 2626 counting only the distinct ones).

The product of its (nonzero) digits is 714420, while the sum is 50.

The square root of 79997540 is about 8944.1343907614. The cubic root of 79997540 is about 430.8825213700.

The spelling of 79997540 in words is "seventy-nine million, nine hundred ninety-seven thousand, five hundred forty".