78378570309 has 32 divisors (see below), whose sum is σ = 122552035200. Its totient is φ = 44118708480.

The previous prime is 78378570301. The next prime is 78378570331. The reversal of 78378570309 is 90307587387.

It is not a de Polignac number, because 78378570309 - 2³ = 78378570301 is a prime.

It is a super-2 number, since 2×78378570309² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78378570301) 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, 1802202 + ... + 1845179.

It is an arithmetic number, because the mean of its divisors is an integer number (3829751100).

Almost surely, 2^78378570309 is an apocalyptic number.

It is an amenable number.

78378570309 is a deficient number, since it is larger than the sum of its proper divisors (44173464891).

78378570309 is a wasteful number, since it uses less digits than its factorization.

78378570309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3647445.

The product of its (nonzero) digits is 8890560, while the sum is 57.

The spelling of 78378570309 in words is "seventy-eight billion, three hundred seventy-eight million, five hundred seventy thousand, three hundred nine".