78515563 has 16 divisors (see below), whose sum is σ = 91514880. Its totient is φ = 65973600.

The previous prime is 78515539. The next prime is 78515573. The reversal of 78515563 is 36551587.

It is not a de Polignac number, because 78515563 - 2¹³ = 78507371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78515513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118453 + ... + 119113.

It is an arithmetic number, because the mean of its divisors is an integer number (5719680).

Almost surely, 2^78515563 is an apocalyptic number.

78515563 is a deficient number, since it is larger than the sum of its proper divisors (12999317).

78515563 is a wasteful number, since it uses less digits than its factorization.

78515563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978.

The product of its digits is 126000, while the sum is 40.

The square root of 78515563 is about 8860.9008007087. The cubic root of 78515563 is about 428.2051797402.

The spelling of 78515563 in words is "seventy-eight million, five hundred fifteen thousand, five hundred sixty-three".