1987400880 has 160 divisors (see below), whose sum is σ = 6910272000. Its totient is φ = 524959488.

The previous prime is 1987400879. The next prime is 1987400903. The reversal of 1987400880 is 880047891.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 226821 + ... + 235419.

It is an arithmetic number, because the mean of its divisors is an integer number (43189200).

Almost surely, 2^1987400880 is an apocalyptic number.

1987400880 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 1987400880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3455136000).

1987400880 is an abundant number, since it is smaller than the sum of its proper divisors (4922871120).

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

1987400880 is a wasteful number, since it uses less digits than its factorization.

1987400880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8728 (or 8716 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 1987400880 is about 44580.2745617386. The cubic root of 1987400880 is about 1257.2698254779.

The spelling of 1987400880 in words is "one billion, nine hundred eighty-seven million, four hundred thousand, eight hundred eighty".