78880515 has 64 divisors (see below), whose sum is σ = 150377472. Its totient is φ = 34560000.

The previous prime is 78880511. The next prime is 78880531. The reversal of 78880515 is 51508887.

It is not a de Polignac number, because 78880515 - 2² = 78880511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78880511) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 314140 + ... + 314390.

It is an arithmetic number, because the mean of its divisors is an integer number (2349648).

Almost surely, 2^78880515 is an apocalyptic number.

78880515 is a deficient number, since it is larger than the sum of its proper divisors (71496957).

78880515 is a wasteful number, since it uses less digits than its factorization.

78880515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380.

The product of its (nonzero) digits is 89600, while the sum is 42.

The square root of 78880515 is about 8881.4703174643. The cubic root of 78880515 is about 428.8676082038.

The spelling of 78880515 in words is "seventy-eight million, eight hundred eighty thousand, five hundred fifteen".