79699140 has 216 divisors, whose sum is σ = 270536448. Its totient is φ = 19673280.

The previous prime is 79699097. The next prime is 79699141. The reversal of 79699140 is 4199697.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79699141) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2570925 + ... + 2570955.

Almost surely, 2^79699140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79699140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135268224).

79699140 is an abundant number, since it is smaller than the sum of its proper divisors (190837308).

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

79699140 is a wasteful number, since it uses less digits than its factorization.

79699140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 79699140 is about 8927.4374822790. The cubic root of 79699140 is about 430.3461067777.

The spelling of 79699140 in words is "seventy-nine million, six hundred ninety-nine thousand, one hundred forty".