78919397457 has 8 divisors (see below), whose sum is σ = 108854341440. Its totient is φ = 50798692560.

The previous prime is 78919397423. The next prime is 78919397477. The reversal of 78919397457 is 75479391987.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78919397457 - 2²⁴ = 78902620241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78919397391 and 78919397400.

It is not an unprimeable number, because it can be changed into a prime (78919397407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 453559669 + ... + 453559842.

It is an arithmetic number, because the mean of its divisors is an integer number (13606792680).

Almost surely, 2^78919397457 is an apocalyptic number.

It is an amenable number.

78919397457 is a deficient number, since it is larger than the sum of its proper divisors (29934943983).

78919397457 is a wasteful number, since it uses less digits than its factorization.

78919397457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907119543.

The product of its digits is 120022560, while the sum is 69.

The spelling of 78919397457 in words is "seventy-eight billion, nine hundred nineteen million, three hundred ninety-seven thousand, four hundred fifty-seven".