72154387 has 4 divisors (see below), whose sum is σ = 73832440. Its totient is φ = 70476336.

The previous prime is 72154367. The next prime is 72154393. The reversal of 72154387 is 78345127.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72154387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72154367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 838962 + ... + 839047.

It is an arithmetic number, because the mean of its divisors is an integer number (18458110).

Almost surely, 2^72154387 is an apocalyptic number.

72154387 is a deficient number, since it is larger than the sum of its proper divisors (1678053).

72154387 is a wasteful number, since it uses less digits than its factorization.

72154387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678052.

The product of its digits is 47040, while the sum is 37.

The square root of 72154387 is about 8494.3738439040. The cubic root of 72154387 is about 416.3139022395.

The spelling of 72154387 in words is "seventy-two million, one hundred fifty-four thousand, three hundred eighty-seven".