72015406 has 4 divisors (see below), whose sum is σ = 108023112. Its totient is φ = 36007702.

The previous prime is 72015367. The next prime is 72015413. The reversal of 72015406 is 60451027.

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

It is a super-3 number, since 3×72015406³ (a number of 25 digits) contains 333 as substring.

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, 18003850 + ... + 18003853.

It is an arithmetic number, because the mean of its divisors is an integer number (27005778).

Almost surely, 2^72015406 is an apocalyptic number.

72015406 is a deficient number, since it is larger than the sum of its proper divisors (36007706).

72015406 is a wasteful number, since it uses less digits than its factorization.

72015406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36007705.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 72015406 is about 8486.1891329383. The cubic root of 72015406 is about 416.0464345048.

The spelling of 72015406 in words is "seventy-two million, fifteen thousand, four hundred six".