75216915 has 24 divisors (see below), whose sum is σ = 137239440. Its totient is φ = 38003904.

The previous prime is 75216913. The next prime is 75216941. The reversal of 75216915 is 51961257.

It is not a de Polignac number, because 75216915 - 2¹ = 75216913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 75216915.

It is not an unprimeable number, because it can be changed into a prime (75216913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43132 + ... + 44841.

It is an arithmetic number, because the mean of its divisors is an integer number (5718310).

Almost surely, 2^75216915 is an apocalyptic number.

75216915 is a deficient number, since it is larger than the sum of its proper divisors (62022525).

75216915 is a wasteful number, since it uses less digits than its factorization.

75216915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88003 (or 88000 counting only the distinct ones).

The product of its digits is 18900, while the sum is 36.

The square root of 75216915 is about 8672.7685890954. The cubic root of 75216915 is about 422.1225039850.

The spelling of 75216915 in words is "seventy-five million, two hundred sixteen thousand, nine hundred fifteen".