78378570357 has 16 divisors (see below), whose sum is σ = 104958766080. Its totient is φ = 52025676912.

The previous prime is 78378570353. The next prime is 78378570359. The reversal of 78378570357 is 75307587387.

It is a happy number.

It is not a de Polignac number, because 78378570357 - 2² = 78378570353 is a prime.

It is a super-2 number, since 2×78378570357² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78378570357.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78378570353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1032228 + ... + 1105554.

It is an arithmetic number, because the mean of its divisors is an integer number (6559922880).

Almost surely, 2^78378570357 is an apocalyptic number.

It is an amenable number.

78378570357 is a deficient number, since it is larger than the sum of its proper divisors (26580195723).

78378570357 is a wasteful number, since it uses less digits than its factorization.

78378570357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74872.

The product of its (nonzero) digits is 34574400, while the sum is 60.

The spelling of 78378570357 in words is "seventy-eight billion, three hundred seventy-eight million, five hundred seventy thousand, three hundred fifty-seven".