72861511 has 8 divisors (see below), whose sum is σ = 74245248. Its totient is φ = 71484000.

The previous prime is 72861491. The next prime is 72861527. The reversal of 72861511 is 11516827.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72861511 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 (72861011) 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, 26826 + ... + 29416.

It is an arithmetic number, because the mean of its divisors is an integer number (9280656).

Almost surely, 2^72861511 is an apocalyptic number.

72861511 is a deficient number, since it is larger than the sum of its proper divisors (1383737).

72861511 is a wasteful number, since it uses less digits than its factorization.

72861511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3113.

The product of its digits is 3360, while the sum is 31.

The square root of 72861511 is about 8535.8954421900. The cubic root of 72861511 is about 417.6694635180.

The spelling of 72861511 in words is "seventy-two million, eight hundred sixty-one thousand, five hundred eleven".