78287914645 has 24 divisors (see below), whose sum is σ = 98375402664. Its totient is φ = 59787576576.

The previous prime is 78287914637. The next prime is 78287914669. The reversal of 78287914645 is 54641978287.

It can be written as a sum of positive squares in 12 ways, for example, as 2477451076 + 75810463569 = 49774^2 + 275337^2 .

It is not a de Polignac number, because 78287914645 - 2³ = 78287914637 is a prime.

It is a super-2 number, since 2×78287914645² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 254887 + ... + 470683.

It is an arithmetic number, because the mean of its divisors is an integer number (4098975111).

Almost surely, 2^78287914645 is an apocalyptic number.

It is an amenable number.

78287914645 is a deficient number, since it is larger than the sum of its proper divisors (20087488019).

78287914645 is a wasteful number, since it uses less digits than its factorization.

78287914645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215929 (or 215892 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 61.

The spelling of 78287914645 in words is "seventy-eight billion, two hundred eighty-seven million, nine hundred fourteen thousand, six hundred forty-five".