53679978 has 72 divisors (see below), whose sum is σ = 134087616. Its totient is φ = 15390000.

The previous prime is 53679949. The next prime is 53679991. The reversal of 53679978 is 87997635.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 71103 + ... + 71853.

It is an arithmetic number, because the mean of its divisors is an integer number (1862328).

Almost surely, 2^53679978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53679978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67043808).

53679978 is an abundant number, since it is smaller than the sum of its proper divisors (80407638).

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

53679978 is a wasteful number, since it uses less digits than its factorization.

53679978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808 (or 786 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 54.

The square root of 53679978 is about 7326.6621322400. The cubic root of 53679978 is about 377.2281638738.

The spelling of 53679978 in words is "fifty-three million, six hundred seventy-nine thousand, nine hundred seventy-eight".