1987878592 has 56 divisors (see below), whose sum is σ = 4704258816. Its totient is φ = 814902528.

The previous prime is 1987878551. The next prime is 1987878611. The reversal of 1987878592 is 2958787891.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×1987878592² = 7903322593063804928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86158 + ... + 106765.

Almost surely, 2^1987878592 is an apocalyptic number.

It is an amenable number.

1987878592 is an abundant number, since it is smaller than the sum of its proper divisors (2716380224).

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

1987878592 is a wasteful number, since it uses less digits than its factorization.

1987878592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192965 (or 192955 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 64.

The square root of 1987878592 is about 44585.6321251589. The cubic root of 1987878592 is about 1257.3705541519.

The spelling of 1987878592 in words is "one billion, nine hundred eighty-seven million, eight hundred seventy-eight thousand, five hundred ninety-two".