78297607457 has 4 divisors (see below), whose sum is σ = 78298807620. Its totient is φ = 78296407296.

The previous prime is 78297607441. The next prime is 78297607459. The reversal of 78297607457 is 75470679287.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64308395281 + 13989212176 = 253591^2 + 118276^2 .

It is a cyclic number.

It is not a de Polignac number, because 78297607457 - 2⁴ = 78297607441 is a prime.

It is a super-2 number, since 2×78297607457² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78297607457.

It is not an unprimeable number, because it can be changed into a prime (78297607459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 496232 + ... + 634697.

It is an arithmetic number, because the mean of its divisors is an integer number (19574701905).

Almost surely, 2^78297607457 is an apocalyptic number.

It is an amenable number.

78297607457 is a deficient number, since it is larger than the sum of its proper divisors (1200163).

78297607457 is a wasteful number, since it uses less digits than its factorization.

78297607457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1200162.

The product of its (nonzero) digits is 41489280, while the sum is 62.

The spelling of 78297607457 in words is "seventy-eight billion, two hundred ninety-seven million, six hundred seven thousand, four hundred fifty-seven".