72473551 has 8 divisors (see below), whose sum is σ = 73796864. Its totient is φ = 71154720.

The previous prime is 72473521. The next prime is 72473591. The reversal of 72473551 is 15537427.

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 72473551 - 2⁹ = 72473039 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 (72473521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65761 + ... + 66853.

It is an arithmetic number, because the mean of its divisors is an integer number (9224608).

Almost surely, 2^72473551 is an apocalyptic number.

72473551 is a deficient number, since it is larger than the sum of its proper divisors (1323313).

72473551 is a wasteful number, since it uses less digits than its factorization.

72473551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2241.

The product of its digits is 29400, while the sum is 34.

The square root of 72473551 is about 8513.1399025272. The cubic root of 72473551 is about 416.9268332160.

The spelling of 72473551 in words is "seventy-two million, four hundred seventy-three thousand, five hundred fifty-one".