1979888640 has 176 divisors, whose sum is σ = 6412972608. Its totient is φ = 521273344.

The previous prime is 1979888633. The next prime is 1979888653. The reversal of 1979888640 is 468889791.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1274104 + ... + 1275656.

Almost surely, 2^1979888640 is an apocalyptic number.

1979888640 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 1979888640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3206486304).

1979888640 is an abundant number, since it is smaller than the sum of its proper divisors (4433083968).

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

1979888640 is a wasteful number, since it uses less digits than its factorization.

1979888640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664 (or 1646 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 60.

The square root of 1979888640 is about 44495.9395900345. The cubic root of 1979888640 is about 1255.6836938628.

The spelling of 1979888640 in words is "one billion, nine hundred seventy-nine million, eight hundred eighty-eight thousand, six hundred forty".