78831420 has 24 divisors (see below), whose sum is σ = 220728144. Its totient is φ = 21021696.

The previous prime is 78831413. The next prime is 78831439. The reversal of 78831420 is 2413887.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 656869 + ... + 656988.

It is an arithmetic number, because the mean of its divisors is an integer number (9197006).

Almost surely, 2^78831420 is an apocalyptic number.

It is an amenable number.

78831420 is an abundant number, since it is smaller than the sum of its proper divisors (141896724).

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

78831420 is a wasteful number, since it uses less digits than its factorization.

78831420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313869 (or 1313867 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 78831420 is about 8878.7059867979. The cubic root of 78831420 is about 428.7786144264.

The spelling of 78831420 in words is "seventy-eight million, eight hundred thirty-one thousand, four hundred twenty".