72779806 has 12 divisors (see below), whose sum is σ = 119996856. Its totient is φ = 33081620.

The previous prime is 72779803. The next prime is 72779807. The reversal of 72779806 is 60897727.

It is a super-2 number, since 2×72779806² = 10593800322795272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72779803) 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 5 ways as a sum of consecutive naturals, for example, 150130 + ... + 150613.

It is an arithmetic number, because the mean of its divisors is an integer number (9999738).

Almost surely, 2^72779806 is an apocalyptic number.

72779806 is a deficient number, since it is larger than the sum of its proper divisors (47217050).

72779806 is a wasteful number, since it uses less digits than its factorization.

72779806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300767 (or 300756 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 46.

The square root of 72779806 is about 8531.1081343516. The cubic root of 72779806 is about 417.5132839069.

The spelling of 72779806 in words is "seventy-two million, seven hundred seventy-nine thousand, eight hundred six".