79781040 has 60 divisors (see below), whose sum is σ = 267933744. Its totient is φ = 21274752.

The previous prime is 79781033. The next prime is 79781047. The reversal of 79781040 is 4018797.

It is an interprime number because it is at equal distance from previous prime (79781033) and next prime (79781047).

It is a tau number, because it is divible by the number of its divisors (60).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 79780986 and 79781004.

It is not an unprimeable number, because it can be changed into a prime (79781047) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 54684 + ... + 56123.

Almost surely, 2^79781040 is an apocalyptic number.

It is an amenable number.

79781040 is an abundant number, since it is smaller than the sum of its proper divisors (188152704).

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

79781040 is a wasteful number, since it uses less digits than its factorization.

79781040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110826 (or 110817 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 79781040 is about 8932.0232870274. The cubic root of 79781040 is about 430.4934662939.

The spelling of 79781040 in words is "seventy-nine million, seven hundred eighty-one thousand, forty".