79991628 has 48 divisors (see below), whose sum is σ = 196771680. Its totient is φ = 25252864.

The previous prime is 79991621. The next prime is 79991629. The reversal of 79991628 is 82619997.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (79991621) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 16276 + ... + 20612.

It is an arithmetic number, because the mean of its divisors is an integer number (4099410).

Almost surely, 2^79991628 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 79991628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98385840).

79991628 is an abundant number, since it is smaller than the sum of its proper divisors (116780052).

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

79991628 is a wasteful number, since it uses less digits than its factorization.

79991628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4426 (or 4424 counting only the distinct ones).

The product of its digits is 489888, while the sum is 51.

The square root of 79991628 is about 8943.8038887265. The cubic root of 79991628 is about 430.8719067093.

The spelling of 79991628 in words is "seventy-nine million, nine hundred ninety-one thousand, six hundred twenty-eight".