78976669 has 2 divisors, whose sum is σ = 78976670. Its totient is φ = 78976668.

The previous prime is 78976643. The next prime is 78976691. The reversal of 78976669 is 96667987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71605444 + 7371225 = 8462^2 + 2715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78976669 is a prime.

It is a super-2 number, since 2×78976669² = 12474628492671122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78976609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39488334 + 39488335.

It is an arithmetic number, because the mean of its divisors is an integer number (39488335).

Almost surely, 2^78976669 is an apocalyptic number.

It is an amenable number.

78976669 is a deficient number, since it is larger than the sum of its proper divisors (1).

78976669 is an equidigital number, since it uses as much as digits as its factorization.

78976669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6858432, while the sum is 58.

The square root of 78976669 is about 8886.8818491077. The cubic root of 78976669 is about 429.0417982070.

The spelling of 78976669 in words is "seventy-eight million, nine hundred seventy-six thousand, six hundred sixty-nine".