79249840 has 40 divisors (see below), whose sum is σ = 187742448. Its totient is φ = 31100160.

The previous prime is 79249829. The next prime is 79249861. The reversal of 79249840 is 4894297.

It is a tau number, because it is divible by the number of its divisors (40).

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 7 ways as a sum of consecutive naturals, for example, 5106 + ... + 13585.

Almost surely, 2^79249840 is an apocalyptic number.

It is an amenable number.

79249840 is an abundant number, since it is smaller than the sum of its proper divisors (108492608).

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

79249840 is a wasteful number, since it uses less digits than its factorization.

79249840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18757 (or 18751 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 79249840 is about 8902.2379208826. The cubic root of 79249840 is about 429.5358973232.

It can be divided in two parts, 79249 and 840, that added together give a square (80089 = 283²).

The spelling of 79249840 in words is "seventy-nine million, two hundred forty-nine thousand, eight hundred forty".