78748515 has 12 divisors (see below), whose sum is σ = 136497504. Its totient is φ = 41999184.

The previous prime is 78748507. The next prime is 78748529. The reversal of 78748515 is 51584787.

It is a happy number.

It is not a de Polignac number, because 78748515 - 2³ = 78748507 is a prime.

It is a super-2 number, since 2×78748515² = 12402657229410450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1749967 = 78748515 / (7 + 8 + 7 + 4 + 8 + 5 + 1 + 5).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 874939 + ... + 875028.

It is an arithmetic number, because the mean of its divisors is an integer number (11374792).

Almost surely, 2^78748515 is an apocalyptic number.

78748515 is a deficient number, since it is larger than the sum of its proper divisors (57748989).

78748515 is a wasteful number, since it uses less digits than its factorization.

78748515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749978 (or 1749975 counting only the distinct ones).

The product of its digits is 313600, while the sum is 45.

The square root of 78748515 is about 8874.0360039838. The cubic root of 78748515 is about 428.6282498471.

The spelling of 78748515 in words is "seventy-eight million, seven hundred forty-eight thousand, five hundred fifteen".