72217870 has 16 divisors (see below), whose sum is σ = 137639088. Its totient is φ = 27187840.

The previous prime is 72217837. The next prime is 72217877. The reversal of 72217870 is 7871227.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72217877) 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, 212236 + ... + 212575.

It is an arithmetic number, because the mean of its divisors is an integer number (8602443).

Almost surely, 2^72217870 is an apocalyptic number.

72217870 is a deficient number, since it is larger than the sum of its proper divisors (65421218).

72217870 is a wasteful number, since it uses less digits than its factorization.

72217870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424835.

The product of its (nonzero) digits is 10976, while the sum is 34.

The square root of 72217870 is about 8498.1097898297. The cubic root of 72217870 is about 416.4359604605.

The spelling of 72217870 in words is "seventy-two million, two hundred seventeen thousand, eight hundred seventy".