78902401 has 2 divisors, whose sum is σ = 78902402. Its totient is φ = 78902400.

The previous prime is 78902399. The next prime is 78902437. The reversal of 78902401 is 10420987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78783376 + 119025 = 8876^2 + 345^2 .

It is a cyclic number.

It is not a de Polignac number, because 78902401 - 2¹ = 78902399 is a prime.

Together with 78902399, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78902441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39451200 + 39451201.

It is an arithmetic number, because the mean of its divisors is an integer number (39451201).

Almost surely, 2^78902401 is an apocalyptic number.

It is an amenable number.

78902401 is a deficient number, since it is larger than the sum of its proper divisors (1).

78902401 is an equidigital number, since it uses as much as digits as its factorization.

78902401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 78902401 is about 8882.7023478219. The cubic root of 78902401 is about 428.9072687314.

The spelling of 78902401 in words is "seventy-eight million, nine hundred two thousand, four hundred one".