72727780 has 12 divisors (see below), whose sum is σ = 152728380. Its totient is φ = 29091104.

The previous prime is 72727747. The next prime is 72727789. The reversal of 72727780 is 8772727.

It can be written as a sum of positive squares in 2 ways, for example, as 42719296 + 30008484 = 6536^2 + 5478^2 .

It is not an unprimeable number, because it can be changed into a prime (72727789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1818175 + ... + 1818214.

It is an arithmetic number, because the mean of its divisors is an integer number (12727365).

Almost surely, 2^72727780 is an apocalyptic number.

It is an amenable number.

72727780 is an abundant number, since it is smaller than the sum of its proper divisors (80000600).

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

72727780 is a wasteful number, since it uses less digits than its factorization.

72727780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3636398 (or 3636396 counting only the distinct ones).

The product of its (nonzero) digits is 76832, while the sum is 40.

The square root of 72727780 is about 8528.0583956725. The cubic root of 72727780 is about 417.4137749672.

The spelling of 72727780 in words is "seventy-two million, seven hundred twenty-seven thousand, seven hundred eighty".