72613561 has 8 divisors (see below), whose sum is σ = 73712000. Its totient is φ = 71519760.

The previous prime is 72613559. The next prime is 72613577. The reversal of 72613561 is 16531627.

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 72613561 - 2¹ = 72613559 is a prime.

It is a super-2 number, since 2×72613561² = 10545458482201442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72613531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41890 + ... + 43588.

It is an arithmetic number, because the mean of its divisors is an integer number (9214000).

Almost surely, 2^72613561 is an apocalyptic number.

It is an amenable number.

72613561 is a deficient number, since it is larger than the sum of its proper divisors (1098439).

72613561 is a wasteful number, since it uses less digits than its factorization.

72613561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2319.

The product of its digits is 7560, while the sum is 31.

The square root of 72613561 is about 8521.3591052132. The cubic root of 72613561 is about 417.1951443217.

The spelling of 72613561 in words is "seventy-two million, six hundred thirteen thousand, five hundred sixty-one".