1978512580 has 48 divisors (see below), whose sum is σ = 4576650624. Its totient is φ = 712465920.

The previous prime is 1978512527. The next prime is 1978512619. The reversal of 1978512580 is 852158791.

It is a self number, because there is not a number n which added to its sum of digits gives 1978512580.

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, 20997 + ... + 66316.

It is an arithmetic number, because the mean of its divisors is an integer number (95346888).

Almost surely, 2^1978512580 is an apocalyptic number.

1978512580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1978512580 is an abundant number, since it is smaller than the sum of its proper divisors (2598138044).

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

1978512580 is a wasteful number, since it uses less digits than its factorization.

1978512580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87436 (or 87434 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 46.

The square root of 1978512580 is about 44480.4741431563. The cubic root of 1978512580 is about 1255.3927184800.

The spelling of 1978512580 in words is "one billion, nine hundred seventy-eight million, five hundred twelve thousand, five hundred eighty".