78135807 has 8 divisors (see below), whose sum is σ = 108710784. Its totient is φ = 49825688.

The previous prime is 78135803. The next prime is 78135821. The reversal of 78135807 is 70853187.

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 78135807 - 2² = 78135803 is a prime.

It is a super-2 number, since 2×78135807² = 12210408671082498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78135803) 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, 566133 + ... + 566270.

It is an arithmetic number, because the mean of its divisors is an integer number (13588848).

Almost surely, 2^78135807 is an apocalyptic number.

78135807 is a deficient number, since it is larger than the sum of its proper divisors (30574977).

78135807 is a wasteful number, since it uses less digits than its factorization.

78135807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132429.

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 78135807 is about 8839.4460799306. The cubic root of 78135807 is about 427.5136974511.

The spelling of 78135807 in words is "seventy-eight million, one hundred thirty-five thousand, eight hundred seven".