78930420 has 24 divisors (see below), whose sum is σ = 221005344. Its totient is φ = 21048096.

The previous prime is 78930419. The next prime is 78930421. The reversal of 78930420 is 2403987.

It is an interprime number because it is at equal distance from previous prime (78930419) and next prime (78930421).

It is a super-2 number, since 2×78930420² = 12460022402752800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78930421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 657694 + ... + 657813.

It is an arithmetic number, because the mean of its divisors is an integer number (9208556).

Almost surely, 2^78930420 is an apocalyptic number.

It is an amenable number.

78930420 is an abundant number, since it is smaller than the sum of its proper divisors (142074924).

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

78930420 is a wasteful number, since it uses less digits than its factorization.

78930420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315519 (or 1315517 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 78930420 is about 8884.2793742655. The cubic root of 78930420 is about 428.9580324191.

The spelling of 78930420 in words is "seventy-eight million, nine hundred thirty thousand, four hundred twenty".