79551540 has 36 divisors (see below), whose sum is σ = 241306884. Its totient is φ = 21213696.

The previous prime is 79551533. The next prime is 79551541. The reversal of 79551540 is 4515597.

It can be written as a sum of positive squares in 2 ways, for example, as 37015056 + 42536484 = 6084^2 + 6522^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct 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 = 79551495 and 79551504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79551541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 220797 + ... + 221156.

It is an arithmetic number, because the mean of its divisors is an integer number (6702969).

Almost surely, 2^79551540 is an apocalyptic number.

It is an amenable number.

79551540 is an abundant number, since it is smaller than the sum of its proper divisors (161755344).

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

79551540 is a wasteful number, since it uses less digits than its factorization.

79551540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441968 (or 441963 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 36.

The square root of 79551540 is about 8919.1670014638. The cubic root of 79551540 is about 430.0802806660.

The spelling of 79551540 in words is "seventy-nine million, five hundred fifty-one thousand, five hundred forty".