72617251 has 8 divisors (see below), whose sum is σ = 87873120. Its totient is φ = 58581888.

The previous prime is 72617249. The next prime is 72617327. The reversal of 72617251 is 15271627.

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 72617251 - 2¹ = 72617249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72617201) 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, 304996 + ... + 305233.

It is an arithmetic number, because the mean of its divisors is an integer number (10984140).

Almost surely, 2^72617251 is an apocalyptic number.

72617251 is a deficient number, since it is larger than the sum of its proper divisors (15255869).

72617251 is a wasteful number, since it uses less digits than its factorization.

72617251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610253.

The product of its digits is 5880, while the sum is 31.

The square root of 72617251 is about 8521.5756172201. The cubic root of 72617251 is about 417.2022110641.

Adding to 72617251 its reverse (15271627), we get a palindrome (87888878).

The spelling of 72617251 in words is "seventy-two million, six hundred seventeen thousand, two hundred fifty-one".