72782251 has 4 divisors (see below), whose sum is σ = 72799504. Its totient is φ = 72765000.

The previous prime is 72782233. The next prime is 72782261. The reversal of 72782251 is 15228727.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 72782251 - 2⁷ = 72782123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72782201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2401 + ... + 12301.

It is an arithmetic number, because the mean of its divisors is an integer number (18199876).

Almost surely, 2^72782251 is an apocalyptic number.

72782251 is a deficient number, since it is larger than the sum of its proper divisors (17253).

72782251 is an equidigital number, since it uses as much as digits as its factorization.

72782251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17252.

The product of its digits is 15680, while the sum is 34.

The square root of 72782251 is about 8531.2514322343. The cubic root of 72782251 is about 417.5179592356.

The spelling of 72782251 in words is "seventy-two million, seven hundred eighty-two thousand, two hundred fifty-one".