72312154 has 8 divisors (see below), whose sum is σ = 110990880. Its totient is φ = 35315196.

The previous prime is 72312143. The next prime is 72312187. The reversal of 72312154 is 45121327.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×72312154² = 10458095232239432, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420334 + ... + 420505.

It is an arithmetic number, because the mean of its divisors is an integer number (13873860).

Almost surely, 2^72312154 is an apocalyptic number.

72312154 is a deficient number, since it is larger than the sum of its proper divisors (38678726).

72312154 is a wasteful number, since it uses less digits than its factorization.

72312154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840884.

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

The square root of 72312154 is about 8503.6553316794. The cubic root of 72312154 is about 416.6171075634.

The spelling of 72312154 in words is "seventy-two million, three hundred twelve thousand, one hundred fifty-four".