78357980 has 24 divisors (see below), whose sum is σ = 164779440. Its totient is φ = 31299840.

The previous prime is 78357973. The next prime is 78357989. The reversal of 78357980 is 8975387.

It is a super-2 number, since 2×78357980² = 12279946059360800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78357989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14900 + ... + 19460.

It is an arithmetic number, because the mean of its divisors is an integer number (6865810).

Almost surely, 2^78357980 is an apocalyptic number.

It is an amenable number.

78357980 is an abundant number, since it is smaller than the sum of its proper divisors (86421460).

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

78357980 is a wasteful number, since it uses less digits than its factorization.

78357980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5429 (or 5427 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 78357980 is about 8852.0042928141. The cubic root of 78357980 is about 427.9185144898.

The spelling of 78357980 in words is "seventy-eight million, three hundred fifty-seven thousand, nine hundred eighty".