72172102 has 4 divisors (see below), whose sum is σ = 108258156. Its totient is φ = 36086050.

The previous prime is 72172099. The next prime is 72172117. The reversal of 72172102 is 20127127.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18043024 + ... + 18043027.

It is an arithmetic number, because the mean of its divisors is an integer number (27064539).

Almost surely, 2^72172102 is an apocalyptic number.

72172102 is a deficient number, since it is larger than the sum of its proper divisors (36086054).

72172102 is a wasteful number, since it uses less digits than its factorization.

72172102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36086053.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 72172102 is about 8495.4165289290. The cubic root of 72172102 is about 416.3479699176.

Adding to 72172102 its reverse (20127127), we get a palindrome (92299229).

The spelling of 72172102 in words is "seventy-two million, one hundred seventy-two thousand, one hundred two".