78347680 has 24 divisors (see below), whose sum is σ = 185096772. Its totient is φ = 31339008.

The previous prime is 78347657. The next prime is 78347681. The reversal of 78347680 is 8674387.

It can be written as a sum of positive squares in 2 ways, for example, as 64834704 + 13512976 = 8052^2 + 3676^2 .

It is a super-2 number, since 2×78347680² = 12276717922764800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78347681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244677 + ... + 244996.

Almost surely, 2^78347680 is an apocalyptic number.

It is an amenable number.

78347680 is an abundant number, since it is smaller than the sum of its proper divisors (106749092).

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

78347680 is a wasteful number, since it uses less digits than its factorization.

78347680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489688 (or 489680 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 78347680 is about 8851.4224845502. The cubic root of 78347680 is about 427.8997639902.

The spelling of 78347680 in words is "seventy-eight million, three hundred forty-seven thousand, six hundred eighty".