87750621 has 30 divisors (see below), whose sum is σ = 152492670. Its totient is φ = 50140944.

The previous prime is 87750601. The next prime is 87750623. The reversal of 87750621 is 12605778.

It can be written as a sum of positive squares in only one way, i.e., 59074596 + 28676025 = 7686^2 + 5355^2 .

It is not a de Polignac number, because 87750621 - 2¹⁷ = 87619549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87750623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 7086 + ... + 15023.

It is an arithmetic number, because the mean of its divisors is an integer number (5083089).

Almost surely, 2^87750621 is an apocalyptic number.

87750621 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

87750621 is a deficient number, since it is larger than the sum of its proper divisors (64742049).

87750621 is a wasteful number, since it uses less digits than its factorization.

87750621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22135 (or 22119 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 87750621 is about 9367.5301440668. The cubic root of 87750621 is about 444.3754585265.

The spelling of 87750621 in words is "eighty-seven million, seven hundred fifty thousand, six hundred twenty-one".