1987554730 has 64 divisors (see below), whose sum is σ = 4239267840. Its totient is φ = 656457984.

The previous prime is 1987554713. The next prime is 1987554733. The reversal of 1987554730 is 374557891.

It is a happy number.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1987554733) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1231404 + ... + 1233016.

It is an arithmetic number, because the mean of its divisors is an integer number (66238560).

Almost surely, 2^1987554730 is an apocalyptic number.

1987554730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1987554730 is an abundant number, since it is smaller than the sum of its proper divisors (2251713110).

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

1987554730 is a wasteful number, since it uses less digits than its factorization.

1987554730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263.

The product of its (nonzero) digits is 1058400, while the sum is 49.

The square root of 1987554730 is about 44582.0000672917. Note that the first 4 decimals coincide. The cubic root of 1987554730 is about 1257.3022675104.

The spelling of 1987554730 in words is "one billion, nine hundred eighty-seven million, five hundred fifty-four thousand, seven hundred thirty".