72779428 has 12 divisors (see below), whose sum is σ = 130470732. Its totient is φ = 35502080.

The previous prime is 72779419. The next prime is 72779437. The reversal of 72779428 is 82497727.

It is an interprime number because it is at equal distance from previous prime (72779419) and next prime (72779437).

It can be written as a sum of positive squares in 2 ways, for example, as 14379264 + 58400164 = 3792^2 + 7642^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 221725 + ... + 222052.

It is an arithmetic number, because the mean of its divisors is an integer number (10872561).

Almost surely, 2^72779428 is an apocalyptic number.

It is an amenable number.

72779428 is a deficient number, since it is larger than the sum of its proper divisors (57691304).

72779428 is a wasteful number, since it uses less digits than its factorization.

72779428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443822 (or 443820 counting only the distinct ones).

The product of its digits is 395136, while the sum is 46.

The square root of 72779428 is about 8531.0859801083. The cubic root of 72779428 is about 417.5125610860.

The spelling of 72779428 in words is "seventy-two million, seven hundred seventy-nine thousand, four hundred twenty-eight".