72779012 has 6 divisors (see below), whose sum is σ = 127363278. Its totient is φ = 36389504.

The previous prime is 72778999. The next prime is 72779051. The reversal of 72779012 is 21097727.

It can be written as a sum of positive squares in only one way, i.e., 61716736 + 11062276 = 7856^2 + 3326^2 .

It is a super-2 number, since 2×72779012² = 10593569175392288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9097373 + ... + 9097380.

It is an arithmetic number, because the mean of its divisors is an integer number (21227213).

Almost surely, 2^72779012 is an apocalyptic number.

It is an amenable number.

72779012 is a deficient number, since it is larger than the sum of its proper divisors (54584266).

72779012 is a wasteful number, since it uses less digits than its factorization.

72779012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18194757 (or 18194755 counting only the distinct ones).

The product of its (nonzero) digits is 12348, while the sum is 35.

The square root of 72779012 is about 8531.0615986523. The cubic root of 72779012 is about 417.5117655976.

The spelling of 72779012 in words is "seventy-two million, seven hundred seventy-nine thousand, twelve".