78902641 has 2 divisors, whose sum is σ = 78902642. Its totient is φ = 78902640.

The previous prime is 78902639. The next prime is 78902653. The reversal of 78902641 is 14620987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62742241 + 16160400 = 7921^2 + 4020^2 .

It is a cyclic number.

It is not a de Polignac number, because 78902641 - 2¹ = 78902639 is a prime.

Together with 78902639, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 78902641.

It is not a weakly prime, because it can be changed into another prime (78902671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39451320 + 39451321.

It is an arithmetic number, because the mean of its divisors is an integer number (39451321).

Almost surely, 2^78902641 is an apocalyptic number.

It is an amenable number.

78902641 is a deficient number, since it is larger than the sum of its proper divisors (1).

78902641 is an equidigital number, since it uses as much as digits as its factorization.

78902641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 78902641 is about 8882.7158572139. The cubic root of 78902641 is about 428.9077036047.

The spelling of 78902641 in words is "seventy-eight million, nine hundred two thousand, six hundred forty-one".