78878505 has 8 divisors (see below), whose sum is σ = 126205632. Its totient is φ = 42068528.

The previous prime is 78878491. The next prime is 78878509. The reversal of 78878505 is 50587887.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78878505 - 2⁴ = 78878489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78878509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2629269 + ... + 2629298.

It is an arithmetic number, because the mean of its divisors is an integer number (15775704).

Almost surely, 2^78878505 is an apocalyptic number.

It is an amenable number.

78878505 is a deficient number, since it is larger than the sum of its proper divisors (47327127).

78878505 is a wasteful number, since it uses less digits than its factorization.

78878505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5258575.

The product of its (nonzero) digits is 627200, while the sum is 48.

The square root of 78878505 is about 8881.3571598039. The cubic root of 78878505 is about 428.8639654317.

The spelling of 78878505 in words is "seventy-eight million, eight hundred seventy-eight thousand, five hundred five".