72551511 has 8 divisors (see below), whose sum is σ = 107483760. Its totient is φ = 48367656.

The previous prime is 72551491. The next prime is 72551513. The reversal of 72551511 is 11515527.

It is not a de Polignac number, because 72551511 - 2⁹ = 72550999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2687093 = 72551511 / (7 + 2 + 5 + 5 + 1 + 5 + 1 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72551513) 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, 1343520 + ... + 1343573.

It is an arithmetic number, because the mean of its divisors is an integer number (13435470).

Almost surely, 2^72551511 is an apocalyptic number.

72551511 is a deficient number, since it is larger than the sum of its proper divisors (34932249).

72551511 is a wasteful number, since it uses less digits than its factorization.

72551511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2687102 (or 2687096 counting only the distinct ones).

The product of its digits is 1750, while the sum is 27.

The square root of 72551511 is about 8517.7174759439. The cubic root of 72551511 is about 417.0762760941.

The spelling of 72551511 in words is "seventy-two million, five hundred fifty-one thousand, five hundred eleven".