78494301520 has 40 divisors (see below), whose sum is σ = 183122170056. Its totient is φ = 31290551808.

The previous prime is 78494301511. The next prime is 78494301547. The reversal of 78494301520 is 2510349487.

It can be written as a sum of positive squares in 4 ways, for example, as 6324702784 + 72169598736 = 79528^2 + 268644^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×78494301520² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1650927 + ... + 1697806.

Almost surely, 2^78494301520 is an apocalyptic number.

It is an amenable number.

78494301520 is an abundant number, since it is smaller than the sum of its proper divisors (104627868536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78494301520 is a wasteful number, since it uses less digits than its factorization.

78494301520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3349039 (or 3349033 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 78494301520 in words is "seventy-eight billion, four hundred ninety-four million, three hundred one thousand, five hundred twenty".