72711561 has 8 divisors (see below), whose sum is σ = 104406400. Its totient is φ = 44745552.

The previous prime is 72711559. The next prime is 72711563. The reversal of 72711561 is 16511727.

It is an interprime number because it is at equal distance from previous prime (72711559) and next prime (72711563).

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

It is not a de Polignac number, because 72711561 - 2¹ = 72711559 is a prime.

It is a super-2 number, since 2×72711561² = 10573942206113442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72711563) 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, 932161 + ... + 932238.

It is an arithmetic number, because the mean of its divisors is an integer number (13050800).

Almost surely, 2^72711561 is an apocalyptic number.

It is an amenable number.

72711561 is a deficient number, since it is larger than the sum of its proper divisors (31694839).

72711561 is a wasteful number, since it uses less digits than its factorization.

72711561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864415.

The product of its digits is 2940, while the sum is 30.

The square root of 72711561 is about 8527.1074228017. The cubic root of 72711561 is about 417.3827435541.

The spelling of 72711561 in words is "seventy-two million, seven hundred eleven thousand, five hundred sixty-one".