72170072 has 16 divisors (see below), whose sum is σ = 145728240. Its totient is φ = 33309216.

The previous prime is 72170069. The next prime is 72170107. The reversal of 72170072 is 27007127.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346868 + ... + 347075.

It is an arithmetic number, because the mean of its divisors is an integer number (9108015).

Almost surely, 2^72170072 is an apocalyptic number.

It is an amenable number.

72170072 is an abundant number, since it is smaller than the sum of its proper divisors (73558168).

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

72170072 is a wasteful number, since it uses less digits than its factorization.

72170072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693962 (or 693958 counting only the distinct ones).

The product of its (nonzero) digits is 1372, while the sum is 26.

The square root of 72170072 is about 8495.2970518988. The cubic root of 72170072 is about 416.3440663119.

72170072 divided by its sum of digits (26) gives a palindrome (2775772).

Adding to 72170072 its reverse (27007127), we get a palindrome (99177199).

The spelling of 72170072 in words is "seventy-two million, one hundred seventy thousand, seventy-two".