87987554649 has 12 divisors (see below), whose sum is σ = 127946110500. Its totient is φ = 58264688544.

The previous prime is 87987554593. The next prime is 87987554659. The reversal of 87987554649 is 94645578978.

87987554649 is a `hidden beast` number, since 8 + 7 + 9 + 8 + 7 + 554 + 64 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21647825424 + 66339729225 = 147132^2 + 257565^2 .

It is not a de Polignac number, because 87987554649 - 2¹³ = 87987546457 is a prime.

It is a super-2 number, since 2×87987554649² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87987554659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32805354 + ... + 32808035.

It is an arithmetic number, because the mean of its divisors is an integer number (10662175875).

Almost surely, 2^87987554649 is an apocalyptic number.

It is an amenable number.

87987554649 is a deficient number, since it is larger than the sum of its proper divisors (39958555851).

87987554649 is a wasteful number, since it uses less digits than its factorization.

87987554649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65613544 (or 65613541 counting only the distinct ones).

The product of its digits is 609638400, while the sum is 72.

The spelling of 87987554649 in words is "eighty-seven billion, nine hundred eighty-seven million, five hundred fifty-four thousand, six hundred forty-nine".