72864406 has 4 divisors (see below), whose sum is σ = 109296612. Its totient is φ = 36432202.

The previous prime is 72864401. The next prime is 72864461. The reversal of 72864406 is 60446827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60446827 = 7 ⋅8635261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72864401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18216100 + ... + 18216103.

It is an arithmetic number, because the mean of its divisors is an integer number (27324153).

Almost surely, 2^72864406 is an apocalyptic number.

72864406 is a deficient number, since it is larger than the sum of its proper divisors (36432206).

72864406 is a wasteful number, since it uses less digits than its factorization.

72864406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36432205.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 72864406 is about 8536.0650184965. The cubic root of 72864406 is about 417.6749951860.

The spelling of 72864406 in words is "seventy-two million, eight hundred sixty-four thousand, four hundred six".