79903440 has 60 divisors (see below), whose sum is σ = 268344804. Its totient is φ = 21307392.

The previous prime is 79903429. The next prime is 79903441. The reversal of 79903440 is 4430997.

It can be written as a sum of positive squares in 2 ways, for example, as 42302016 + 37601424 = 6504^2 + 6132^2 .

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

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 = 79903395 and 79903404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79903441) 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, 54769 + ... + 56208.

Almost surely, 2^79903440 is an apocalyptic number.

It is an amenable number.

79903440 is an abundant number, since it is smaller than the sum of its proper divisors (188441364).

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

79903440 is a wasteful number, since it uses less digits than its factorization.

79903440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110996 (or 110987 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 79903440 is about 8938.8724121110. The cubic root of 79903440 is about 430.7135080329.

The spelling of 79903440 in words is "seventy-nine million, nine hundred three thousand, four hundred forty".