78990063 has 16 divisors (see below), whose sum is σ = 106930176. Its totient is φ = 51861600.

The previous prime is 78990061. The next prime is 78990071. The reversal of 78990063 is 36009987.

It is a happy number.

It is not a de Polignac number, because 78990063 - 2¹ = 78990061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78989997 and 78990024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78990061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56845 + ... + 58217.

It is an arithmetic number, because the mean of its divisors is an integer number (6683136).

Almost surely, 2^78990063 is an apocalyptic number.

78990063 is a deficient number, since it is larger than the sum of its proper divisors (27940113).

78990063 is a wasteful number, since it uses less digits than its factorization.

78990063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 78990063 is about 8887.6353998125. The cubic root of 78990063 is about 429.0660511966.

The spelling of 78990063 in words is "seventy-eight million, nine hundred ninety thousand, sixty-three".