78340660 has 12 divisors (see below), whose sum is σ = 164515428. Its totient is φ = 31336256.

The previous prime is 78340657. The next prime is 78340697. The reversal of 78340660 is 6604387.

It can be written as a sum of positive squares in 2 ways, for example, as 13118884 + 65221776 = 3622^2 + 8076^2 .

It is a super-2 number, since 2×78340660² = 12274518018471200, which 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 3 ways as a sum of consecutive naturals, for example, 1958497 + ... + 1958536.

It is an arithmetic number, because the mean of its divisors is an integer number (13709619).

Almost surely, 2^78340660 is an apocalyptic number.

It is an amenable number.

78340660 is an abundant number, since it is smaller than the sum of its proper divisors (86174768).

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

78340660 is a wasteful number, since it uses less digits than its factorization.

78340660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3917042 (or 3917040 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 78340660 is about 8851.0259292355. The cubic root of 78340660 is about 427.8869835817.

The spelling of 78340660 in words is "seventy-eight million, three hundred forty thousand, six hundred sixty".