72415391 has 4 divisors (see below), whose sum is σ = 73956192. Its totient is φ = 70874592.

The previous prime is 72415373. The next prime is 72415423. The reversal of 72415391 is 19351427.

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

It is a cyclic number.

It is not a de Polignac number, because 72415391 - 2²⁶ = 5306527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72415991) 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, 770330 + ... + 770423.

It is an arithmetic number, because the mean of its divisors is an integer number (18489048).

Almost surely, 2^72415391 is an apocalyptic number.

72415391 is a deficient number, since it is larger than the sum of its proper divisors (1540801).

72415391 is a wasteful number, since it uses less digits than its factorization.

72415391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540800.

The product of its digits is 7560, while the sum is 32.

The square root of 72415391 is about 8509.7233210017. The cubic root of 72415391 is about 416.8152754885.

The spelling of 72415391 in words is "seventy-two million, four hundred fifteen thousand, three hundred ninety-one".