72507518 has 4 divisors (see below), whose sum is σ = 108761280. Its totient is φ = 36253758.

The previous prime is 72507517. The next prime is 72507527. The reversal of 72507518 is 81570527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81570527 = 43 ⋅1896989.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72507517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18126878 + ... + 18126881.

It is an arithmetic number, because the mean of its divisors is an integer number (27190320).

Almost surely, 2^72507518 is an apocalyptic number.

72507518 is a deficient number, since it is larger than the sum of its proper divisors (36253762).

72507518 is a wasteful number, since it uses less digits than its factorization.

72507518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36253761.

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 72507518 is about 8515.1346436800. The cubic root of 72507518 is about 416.9919583165.

The spelling of 72507518 in words is "seventy-two million, five hundred seven thousand, five hundred eighteen".