612849978 has 96 divisors (see below), whose sum is σ = 1513512000. Its totient is φ = 177666048.

The previous prime is 612849961. The next prime is 612849989. The reversal of 612849978 is 879948216.

612849978 is a `hidden beast` number, since 61 + 28 + 499 + 78 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1364698 + ... + 1365146.

It is an arithmetic number, because the mean of its divisors is an integer number (15765750).

Almost surely, 2^612849978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 612849978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (756756000).

612849978 is an abundant number, since it is smaller than the sum of its proper divisors (900662022).

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

612849978 is a wasteful number, since it uses less digits than its factorization.

612849978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796 (or 793 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 612849978 is about 24755.8069551368. The cubic root of 612849978 is about 849.4113469884.

The spelling of 612849978 in words is "six hundred twelve million, eight hundred forty-nine thousand, nine hundred seventy-eight".