1979557580 has 288 divisors, whose sum is σ = 5743301760. Its totient is φ = 557568000.

The previous prime is 1979557561. The next prime is 1979557621. The reversal of 1979557580 is 857559791.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 19599530 + ... + 19599630.

It is an arithmetic number, because the mean of its divisors is an integer number (19942020).

Almost surely, 2^1979557580 is an apocalyptic number.

1979557580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1979557580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2871650880).

1979557580 is an abundant number, since it is smaller than the sum of its proper divisors (3763744180).

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

1979557580 is a wasteful number, since it uses less digits than its factorization.

1979557580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 3969000, while the sum is 56.

The square root of 1979557580 is about 44492.2193197867. The cubic root of 1979557580 is about 1255.6137017418.

The spelling of 1979557580 in words is "one billion, nine hundred seventy-nine million, five hundred fifty-seven thousand, five hundred eighty".