87644420 has 24 divisors (see below), whose sum is σ = 184353624. Its totient is φ = 35000576.

The previous prime is 87644419. The next prime is 87644437. The reversal of 87644420 is 2444678.

It can be written as a sum of positive squares in 4 ways, for example, as 20502784 + 67141636 = 4528^2 + 8194^2 .

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10304 + ... + 16776.

It is an arithmetic number, because the mean of its divisors is an integer number (7681401).

Almost surely, 2^87644420 is an apocalyptic number.

It is an amenable number.

87644420 is an abundant number, since it is smaller than the sum of its proper divisors (96709204).

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

87644420 is a wasteful number, since it uses less digits than its factorization.

87644420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7159 (or 7157 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 35.

The square root of 87644420 is about 9361.8598579556. The cubic root of 87644420 is about 444.1961163217.

The spelling of 87644420 in words is "eighty-seven million, six hundred forty-four thousand, four hundred twenty".