79299640 has 48 divisors (see below), whose sum is σ = 207559800. Its totient is φ = 27187776.

The previous prime is 79299631. The next prime is 79299641. The reversal of 79299640 is 4699297.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79299641) 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, 18270 + ... + 22189.

Almost surely, 2^79299640 is an apocalyptic number.

79299640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

79299640 is an abundant number, since it is smaller than the sum of its proper divisors (128260160).

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

79299640 is a wasteful number, since it uses less digits than its factorization.

79299640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40484 (or 40473 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 79299640 is about 8905.0345310953. The cubic root of 79299640 is about 429.6258508534.

The spelling of 79299640 in words is "seventy-nine million, two hundred ninety-nine thousand, six hundred forty".