78648999 has 32 divisors (see below), whose sum is σ = 129696000. Its totient is φ = 41679360.

The previous prime is 78648991. The next prime is 78649007. The reversal of 78648999 is 99984687.

It is an interprime number because it is at equal distance from previous prime (78648991) and next prime (78649007).

It is not a de Polignac number, because 78648999 - 2³ = 78648991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78648991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3327 + ... + 12975.

It is an arithmetic number, because the mean of its divisors is an integer number (4053000).

Almost surely, 2^78648999 is an apocalyptic number.

78648999 is a deficient number, since it is larger than the sum of its proper divisors (51047001).

78648999 is a wasteful number, since it uses less digits than its factorization.

78648999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9695.

The product of its digits is 7838208, while the sum is 60.

The square root of 78648999 is about 8868.4270871446. The cubic root of 78648999 is about 428.4476185058.

The spelling of 78648999 in words is "seventy-eight million, six hundred forty-eight thousand, nine hundred ninety-nine".