72801720 has 64 divisors (see below), whose sum is σ = 242676000. Its totient is φ = 19413504.

The previous prime is 72801713. The next prime is 72801721. The reversal of 72801720 is 2710827.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72801721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32625 + ... + 34784.

Almost surely, 2^72801720 is an apocalyptic number.

It is an amenable number.

72801720 is an abundant number, since it is smaller than the sum of its proper divisors (169874280).

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

72801720 is a wasteful number, since it uses less digits than its factorization.

72801720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67429 (or 67419 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 72801720 is about 8532.3923960399. The cubic root of 72801720 is about 417.5551841192. Note that the first 3 decimals are identical.

The spelling of 72801720 in words is "seventy-two million, eight hundred one thousand, seven hundred twenty".