87620172444 has 60 divisors (see below), whose sum is σ = 261778793584. Its totient is φ = 25034334336.

The previous prime is 87620172433. The next prime is 87620172449. The reversal of 87620172444 is 44427102678.

87620172444 is a `hidden beast` number, since 8 + 7 + 620 + 17 + 2 + 4 + 4 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 87620172444.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87620172449) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19314349 + ... + 19318884.

Almost surely, 2^87620172444 is an apocalyptic number.

87620172444 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

87620172444 is an abundant number, since it is smaller than the sum of its proper divisors (174158621140).

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

87620172444 is a wasteful number, since it uses less digits than its factorization.

87620172444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38633256 (or 38633245 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 45.

The spelling of 87620172444 in words is "eighty-seven billion, six hundred twenty million, one hundred seventy-two thousand, four hundred forty-four".