78298889420257 has 32 divisors (see below), whose sum is σ = 91253055479040. Its totient is φ = 66394929377280.

The previous prime is 78298889420249. The next prime is 78298889420309. The reversal of 78298889420257 is 75202498889287.

It is a cyclic number.

It is not a de Polignac number, because 78298889420257 - 2³ = 78298889420249 is a prime.

It is a super-2 number, since 2×78298889420257² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78298889420357) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6804219 + ... + 14244127.

It is an arithmetic number, because the mean of its divisors is an integer number (2851657983720).

Almost surely, 2^{78298889420257} is an apocalyptic number.

It is an amenable number.

78298889420257 is a deficient number, since it is larger than the sum of its proper divisors (12954166058783).

78298889420257 is a wasteful number, since it uses less digits than its factorization.

78298889420257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7440441.

The product of its (nonzero) digits is 2601123840, while the sum is 79.

The spelling of 78298889420257 in words is "seventy-eight trillion, two hundred ninety-eight billion, eight hundred eighty-nine million, four hundred twenty thousand, two hundred fifty-seven".