78728130 has 48 divisors (see below), whose sum is σ = 220442040. Its totient is φ = 19378944.

The previous prime is 78728129. The next prime is 78728131. The reversal of 78728130 is 3182787.

It is an interprime number because it is at equal distance from previous prime (78728129) and next prime (78728131).

It can be written as a sum of positive squares in 4 ways, for example, as 29909961 + 48818169 = 5469^2 + 6987^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78728131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32475 + ... + 34814.

Almost surely, 2^78728130 is an apocalyptic number.

78728130 is an abundant number, since it is smaller than the sum of its proper divisors (141713910).

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

78728130 is a wasteful number, since it uses less digits than its factorization.

78728130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67315 (or 67312 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 78728130 is about 8872.8873541818. The cubic root of 78728130 is about 428.5912614631.

The spelling of 78728130 in words is "seventy-eight million, seven hundred twenty-eight thousand, one hundred thirty".