72481649 has 4 divisors (see below), whose sum is σ = 72545136. Its totient is φ = 72418164.

The previous prime is 72481613. The next prime is 72481663. The reversal of 72481649 is 94618427.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72481649 - 2⁸ = 72481393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72481609) 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, 29999 + ... + 32324.

It is an arithmetic number, because the mean of its divisors is an integer number (18136284).

Almost surely, 2^72481649 is an apocalyptic number.

It is an amenable number.

72481649 is a deficient number, since it is larger than the sum of its proper divisors (63487).

72481649 is a wasteful number, since it uses less digits than its factorization.

72481649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63486.

The product of its digits is 96768, while the sum is 41.

The square root of 72481649 is about 8513.6155069395. The cubic root of 72481649 is about 416.9423613993.

The spelling of 72481649 in words is "seventy-two million, four hundred eighty-one thousand, six hundred forty-nine".