772139808 has 144 divisors (see below), whose sum is σ = 2499771456. Its totient is φ = 223787520.

The previous prime is 772139783. The next prime is 772139821. The reversal of 772139808 is 808931277.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67566 + ... + 78162.

It is an arithmetic number, because the mean of its divisors is an integer number (17359524).

Almost surely, 2^772139808 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 772139808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1249885728).

772139808 is an abundant number, since it is smaller than the sum of its proper divisors (1727631648).

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

772139808 is a wasteful number, since it uses less digits than its factorization.

772139808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10647 (or 10636 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 772139808 is about 27787.4037650155. The cubic root of 772139808 is about 917.4138967426.

The spelling of 772139808 in words is "seven hundred seventy-two million, one hundred thirty-nine thousand, eight hundred eight".