78311001785 has 16 divisors (see below), whose sum is σ = 95593322880. Its totient is φ = 61569329280.

The previous prime is 78311001781. The next prime is 78311001793. The reversal of 78311001785 is 58710011387.

It is a happy number.

It is not a de Polignac number, because 78311001785 - 2² = 78311001781 is a prime.

It is a super-2 number, since 2×78311001785² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78311001781) 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, 1046789 + ... + 1119101.

It is an arithmetic number, because the mean of its divisors is an integer number (5974582680).

Almost surely, 2^78311001785 is an apocalyptic number.

It is an amenable number.

78311001785 is a deficient number, since it is larger than the sum of its proper divisors (17282321095).

78311001785 is a wasteful number, since it uses less digits than its factorization.

78311001785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76048.

The product of its (nonzero) digits is 47040, while the sum is 41.

The spelling of 78311001785 in words is "seventy-eight billion, three hundred eleven million, one thousand, seven hundred eighty-five".