78420608 has 32 divisors (see below), whose sum is σ = 178548960. Its totient is φ = 33608448.

The previous prime is 78420599. The next prime is 78420613. The reversal of 78420608 is 80602487.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×78420608² = 12299583518179328, which contains 22 as substring.

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, 42866 + ... + 44657.

It is an arithmetic number, because the mean of its divisors is an integer number (5579655).

Almost surely, 2^78420608 is an apocalyptic number.

It is an amenable number.

78420608 is an abundant number, since it is smaller than the sum of its proper divisors (100128352).

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

78420608 is an equidigital number, since it uses as much as digits as its factorization.

78420608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87544 (or 87532 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 78420608 is about 8855.5410901875. The cubic root of 78420608 is about 428.0324894544.

The spelling of 78420608 in words is "seventy-eight million, four hundred twenty thousand, six hundred eight".