87770172 has 36 divisors (see below), whose sum is σ = 238234920. Its totient is φ = 25077024.

The previous prime is 87770171. The next prime is 87770191. The reversal of 87770172 is 27107778.

It is a self number, because there is not a number n which added to its sum of digits gives 87770172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87770171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74047 + ... + 75222.

Almost surely, 2^87770172 is an apocalyptic number.

It is an amenable number.

87770172 is an abundant number, since it is smaller than the sum of its proper divisors (150464748).

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

87770172 is a wasteful number, since it uses less digits than its factorization.

87770172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149290 (or 149281 counting only the distinct ones).

The product of its (nonzero) digits is 38416, while the sum is 39.

The square root of 87770172 is about 9368.5736374328. The cubic root of 87770172 is about 444.4084586327.

The spelling of 87770172 in words is "eighty-seven million, seven hundred seventy thousand, one hundred seventy-two".