79899750 has 256 divisors, whose sum is σ = 269568000. Its totient is φ = 17107200.

The previous prime is 79899739. The next prime is 79899751. The reversal of 79899750 is 5799897.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79899751) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 897706 + ... + 897794.

It is an arithmetic number, because the mean of its divisors is an integer number (1053000).

Almost surely, 2^79899750 is an apocalyptic number.

79899750 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 79899750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134784000).

79899750 is an abundant number, since it is smaller than the sum of its proper divisors (189668250).

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

79899750 is a wasteful number, since it uses less digits than its factorization.

79899750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 54.

The square root of 79899750 is about 8938.6660078560. Note that the first 3 decimals coincide. The cubic root of 79899750 is about 430.7068777080.

The spelling of 79899750 in words is "seventy-nine million, eight hundred ninety-nine thousand, seven hundred fifty".