78507513 has 24 divisors (see below), whose sum is σ = 137225088. Its totient is φ = 42221952.

The previous prime is 78507491. The next prime is 78507521. The reversal of 78507513 is 31570587.

It is not a de Polignac number, because 78507513 - 2¹² = 78503417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78507613) 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, 35581 + ... + 37722.

It is an arithmetic number, because the mean of its divisors is an integer number (5717712).

Almost surely, 2^78507513 is an apocalyptic number.

It is an amenable number.

78507513 is a deficient number, since it is larger than the sum of its proper divisors (58717575).

78507513 is a wasteful number, since it uses less digits than its factorization.

78507513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73333 (or 73330 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 36.

The square root of 78507513 is about 8860.4465463091. The cubic root of 78507513 is about 428.1905449792.

The spelling of 78507513 in words is "seventy-eight million, five hundred seven thousand, five hundred thirteen".