72708621 has 8 divisors (see below), whose sum is σ = 99309504. Its totient is φ = 47290080.

The previous prime is 72708619. The next prime is 72708653. The reversal of 72708621 is 12680727.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72708621 - 2¹ = 72708619 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72708661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295441 + ... + 295686.

It is an arithmetic number, because the mean of its divisors is an integer number (12413688).

Almost surely, 2^72708621 is an apocalyptic number.

It is an amenable number.

72708621 is a deficient number, since it is larger than the sum of its proper divisors (26600883).

72708621 is a wasteful number, since it uses less digits than its factorization.

72708621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591171.

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 72708621 is about 8526.9350296575. The cubic root of 72708621 is about 417.3771180305.

It can be divided in two parts, 7 and 2708621, that added together give a triangular number (2708628 = T₂₃₂₇).

The spelling of 72708621 in words is "seventy-two million, seven hundred eight thousand, six hundred twenty-one".