72406868 has 6 divisors (see below), whose sum is σ = 126712026. Its totient is φ = 36203432.

The previous prime is 72406843. The next prime is 72406877. The reversal of 72406868 is 86860427.

It can be written as a sum of positive squares in only one way, i.e., 70090384 + 2316484 = 8372^2 + 1522^2 .

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, 9050855 + ... + 9050862.

It is an arithmetic number, because the mean of its divisors is an integer number (21118671).

Almost surely, 2^72406868 is an apocalyptic number.

It is an amenable number.

72406868 is a deficient number, since it is larger than the sum of its proper divisors (54305158).

72406868 is a wasteful number, since it uses less digits than its factorization.

72406868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18101721 (or 18101719 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 72406868 is about 8509.2225261771. Note that the first 3 decimals coincide. The cubic root of 72406868 is about 416.7989223536.

The spelling of 72406868 in words is "seventy-two million, four hundred six thousand, eight hundred sixty-eight".