72770238720 has 108 divisors (see below), whose sum is σ = 251777485596. Its totient is φ = 19405393920.

The previous prime is 72770238647. The next prime is 72770238757. The reversal of 72770238720 is 2783207727.

It can be written as a sum of positive squares in 2 ways, for example, as 45994807296 + 26775431424 = 214464^2 + 163632^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3146911 + ... + 3169950.

Almost surely, 2^72770238720 is an apocalyptic number.

It is an amenable number.

72770238720 is an abundant number, since it is smaller than the sum of its proper divisors (179007246876).

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

72770238720 is a wasteful number, since it uses less digits than its factorization.

72770238720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6316888 (or 6316871 counting only the distinct ones).

The product of its (nonzero) digits is 460992, while the sum is 45.

The spelling of 72770238720 in words is "seventy-two billion, seven hundred seventy million, two hundred thirty-eight thousand, seven hundred twenty".