72820470 has 16 divisors (see below), whose sum is σ = 174769200. Its totient is φ = 19418784.

The previous prime is 72820453. The next prime is 72820471. The reversal of 72820470 is 7402827.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2427349 = 72820470 / (7 + 2 + 8 + 2 + 0 + 4 + 7 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72820471) 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, 1213645 + ... + 1213704.

It is an arithmetic number, because the mean of its divisors is an integer number (10923075).

Almost surely, 2^72820470 is an apocalyptic number.

72820470 is an abundant number, since it is smaller than the sum of its proper divisors (101948730).

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

72820470 is a wasteful number, since it uses less digits than its factorization.

72820470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427359.

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 72820470 is about 8533.4910792711. The cubic root of 72820470 is about 417.5910279961.

The spelling of 72820470 in words is "seventy-two million, eight hundred twenty thousand, four hundred seventy".