78630420 has 96 divisors (see below), whose sum is σ = 242605440. Its totient is φ = 18869760.

The previous prime is 78630407. The next prime is 78630437. The reversal of 78630420 is 2403687.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71394 + ... + 72486.

It is an arithmetic number, because the mean of its divisors is an integer number (2527140).

Almost surely, 2^78630420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78630420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121302720).

78630420 is an abundant number, since it is smaller than the sum of its proper divisors (163975020).

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

78630420 is a wasteful number, since it uses less digits than its factorization.

78630420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225 (or 1223 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 78630420 is about 8867.3795452772. The cubic root of 78630420 is about 428.4138789147.

The spelling of 78630420 in words is "seventy-eight million, six hundred thirty thousand, four hundred twenty".