72187406 has 16 divisors (see below), whose sum is σ = 118350720. Its totient is φ = 32874240.

The previous prime is 72187399. The next prime is 72187421. The reversal of 72187406 is 60478127.

It is a happy number.

It is a super-2 number, since 2×72187406² = 10422043170017672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33191 + ... + 35298.

It is an arithmetic number, because the mean of its divisors is an integer number (7396920).

Almost surely, 2^72187406 is an apocalyptic number.

72187406 is a deficient number, since it is larger than the sum of its proper divisors (46163314).

72187406 is a wasteful number, since it uses less digits than its factorization.

72187406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68539.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 72187406 is about 8496.3172021765. The cubic root of 72187406 is about 416.3773965189.

The spelling of 72187406 in words is "seventy-two million, one hundred eighty-seven thousand, four hundred six".