72561534 has 8 divisors (see below), whose sum is σ = 145123080. Its totient is φ = 24187176.

The previous prime is 72561521. The next prime is 72561547. The reversal of 72561534 is 43516527.

It is an interprime number because it is at equal distance from previous prime (72561521) and next prime (72561547).

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

72561534 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 72561495 and 72561504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6046789 + ... + 6046800.

It is an arithmetic number, because the mean of its divisors is an integer number (18140385).

Almost surely, 2^72561534 is an apocalyptic number.

72561534 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72561534 is a wasteful number, since it uses less digits than its factorization.

72561534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12093594.

The product of its digits is 25200, while the sum is 33.

The square root of 72561534 is about 8518.3058174733. The cubic root of 72561534 is about 417.0954815890.

The spelling of 72561534 in words is "seventy-two million, five hundred sixty-one thousand, five hundred thirty-four".