78633420 has 48 divisors (see below), whose sum is σ = 220835328. Its totient is φ = 20905920.

The previous prime is 78633407. The next prime is 78633421. The reversal of 78633420 is 2433687.

It is not an unprimeable number, because it can be changed into a prime (78633421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20235 + ... + 23805.

It is an arithmetic number, because the mean of its divisors is an integer number (4600736).

Almost surely, 2^78633420 is an apocalyptic number.

It is an amenable number.

78633420 is an abundant number, since it is smaller than the sum of its proper divisors (142201908).

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

78633420 is a wasteful number, since it uses less digits than its factorization.

78633420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3950 (or 3948 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 78633420 is about 8867.5487029957. The cubic root of 78633420 is about 428.4193272950.

The spelling of 78633420 in words is "seventy-eight million, six hundred thirty-three thousand, four hundred twenty".