78432997 has 2 divisors, whose sum is σ = 78432998. Its totient is φ = 78432996.

The previous prime is 78432983. The next prime is 78433009. The reversal of 78432997 is 79923487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68409441 + 10023556 = 8271^2 + 3166^2 .

It is a cyclic number.

It is not a de Polignac number, because 78432997 - 2¹¹ = 78430949 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78432997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78432197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39216498 + 39216499.

It is an arithmetic number, because the mean of its divisors is an integer number (39216499).

Almost surely, 2^78432997 is an apocalyptic number.

It is an amenable number.

78432997 is a deficient number, since it is larger than the sum of its proper divisors (1).

78432997 is an equidigital number, since it uses as much as digits as its factorization.

78432997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 49.

The square root of 78432997 is about 8856.2405680966. The cubic root of 78432997 is about 428.0550286628.

The spelling of 78432997 in words is "seventy-eight million, four hundred thirty-two thousand, nine hundred ninety-seven".