79878973 has 2 divisors, whose sum is σ = 79878974. Its totient is φ = 79878972.

The previous prime is 79878961. The next prime is 79879061. The reversal of 79878973 is 37987897.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60886809 + 18992164 = 7803^2 + 4358^2 .

It is a cyclic number.

It is not a de Polignac number, because 79878973 - 2¹³ = 79870781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79878913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39939486 + 39939487.

It is an arithmetic number, because the mean of its divisors is an integer number (39939487).

Almost surely, 2^79878973 is an apocalyptic number.

It is an amenable number.

79878973 is a deficient number, since it is larger than the sum of its proper divisors (1).

79878973 is an equidigital number, since it uses as much as digits as its factorization.

79878973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5334336, while the sum is 58.

The square root of 79878973 is about 8937.5037342650. The cubic root of 79878973 is about 430.6695410347.

The spelling of 79878973 in words is "seventy-nine million, eight hundred seventy-eight thousand, nine hundred seventy-three".