87290172 has 144 divisors (see below), whose sum is σ = 249080832. Its totient is φ = 25643520.

The previous prime is 87290167. The next prime is 87290173. The reversal of 87290172 is 27109278.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87290173) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 815743 + ... + 815849.

It is an arithmetic number, because the mean of its divisors is an integer number (1729728).

Almost surely, 2^87290172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87290172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124540416).

87290172 is an abundant number, since it is smaller than the sum of its proper divisors (161790660).

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

87290172 is a wasteful number, since it uses less digits than its factorization.

87290172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 87290172 is about 9342.9209565317. The cubic root of 87290172 is about 443.5968461223.

The spelling of 87290172 in words is "eighty-seven million, two hundred ninety thousand, one hundred seventy-two".