78198807 has 8 divisors (see below), whose sum is σ = 104386176. Its totient is φ = 52071992.

The previous prime is 78198787. The next prime is 78198817. The reversal of 78198807 is 70889187.

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 78198807 - 2²⁰ = 77150231 is a prime.

It is a super-2 number, since 2×78198807² = 12230106832446498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78198817) 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, 12033 + ... + 17354.

It is an arithmetic number, because the mean of its divisors is an integer number (13048272).

Almost surely, 2^78198807 is an apocalyptic number.

78198807 is a deficient number, since it is larger than the sum of its proper divisors (26187369).

78198807 is a wasteful number, since it uses less digits than its factorization.

78198807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30277.

The product of its (nonzero) digits is 225792, while the sum is 48.

The square root of 78198807 is about 8843.0089336153. The cubic root of 78198807 is about 427.6285663719.

The spelling of 78198807 in words is "seventy-eight million, one hundred ninety-eight thousand, eight hundred seven".