78633997 has 4 divisors (see below), whose sum is σ = 84682780. Its totient is φ = 72585216.

The previous prime is 78633983. The next prime is 78634007. The reversal of 78633997 is 79933687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79933687 = 6599 ⋅12113.

It can be written as a sum of positive squares in 2 ways, for example, as 7214596 + 71419401 = 2686^2 + 8451^2 .

It is a cyclic number.

It is not a de Polignac number, because 78633997 - 2⁷ = 78633869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78633937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3024372 + ... + 3024397.

It is an arithmetic number, because the mean of its divisors is an integer number (21170695).

Almost surely, 2^78633997 is an apocalyptic number.

It is an amenable number.

78633997 is a deficient number, since it is larger than the sum of its proper divisors (6048783).

78633997 is a wasteful number, since it uses less digits than its factorization.

78633997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6048782.

The product of its digits is 1714608, while the sum is 52.

The square root of 78633997 is about 8867.5812372935. The cubic root of 78633997 is about 428.4203751843.

The spelling of 78633997 in words is "seventy-eight million, six hundred thirty-three thousand, nine hundred ninety-seven".