78009930 has 24 divisors (see below), whose sum is σ = 202826052. Its totient is φ = 20802624.

The previous prime is 78009881. The next prime is 78009931. The reversal of 78009930 is 3990087.

It can be written as a sum of positive squares in 2 ways, for example, as 70408881 + 7601049 = 8391^2 + 2757^2 .

It is not an unprimeable number, because it can be changed into a prime (78009931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 433299 + ... + 433478.

Almost surely, 2^78009930 is an apocalyptic number.

78009930 is an abundant number, since it is smaller than the sum of its proper divisors (124816122).

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

78009930 is a wasteful number, since it uses less digits than its factorization.

78009930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866790 (or 866787 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 78009930 is about 8832.3230239841. The cubic root of 78009930 is about 427.2839988110.

The spelling of 78009930 in words is "seventy-eight million, nine thousand, nine hundred thirty".