72500551 has 8 divisors (see below), whose sum is σ = 75121200. Its totient is φ = 69888000.

The previous prime is 72500543. The next prime is 72500573. The reversal of 72500551 is 15500527.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 72500551 - 2³ = 72500543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72500521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20676 + ... + 23926.

It is an arithmetic number, because the mean of its divisors is an integer number (9390150).

Almost surely, 2^72500551 is an apocalyptic number.

72500551 is a deficient number, since it is larger than the sum of its proper divisors (2620649).

72500551 is a wasteful number, since it uses less digits than its factorization.

72500551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4049.

The product of its (nonzero) digits is 1750, while the sum is 25.

The square root of 72500551 is about 8514.7255387358. The cubic root of 72500551 is about 416.9786021106.

The spelling of 72500551 in words is "seventy-two million, five hundred thousand, five hundred fifty-one".