87699920 has 160 divisors (see below), whose sum is σ = 265697280. Its totient is φ = 26104320.

The previous prime is 87699917. The next prime is 87699929. The reversal of 87699920 is 2999678.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87699929) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141371 + ... + 141989.

It is an arithmetic number, because the mean of its divisors is an integer number (1660608).

Almost surely, 2^87699920 is an apocalyptic number.

87699920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87699920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132848640).

87699920 is an abundant number, since it is smaller than the sum of its proper divisors (177997360).

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

87699920 is a wasteful number, since it uses less digits than its factorization.

87699920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673 (or 667 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 87699920 is about 9364.8235434524. The cubic root of 87699920 is about 444.2898575340.

It can be divided in two parts, 87 and 699920, that added together give a palindrome (700007).

The spelling of 87699920 in words is "eighty-seven million, six hundred ninety-nine thousand, nine hundred twenty".