87823520 has 24 divisors (see below), whose sum is σ = 207483444. Its totient is φ = 35129344.

The previous prime is 87823511. The next prime is 87823523. The reversal of 87823520 is 2532878.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 79780624 + 8042896 = 8932^2 + 2836^2 .

It is not an unprimeable number, because it can be changed into a prime (87823523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274289 + ... + 274608.

Almost surely, 2^87823520 is an apocalyptic number.

87823520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

87823520 is an abundant number, since it is smaller than the sum of its proper divisors (119659924).

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

87823520 is a wasteful number, since it uses less digits than its factorization.

87823520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548912 (or 548904 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 87823520 is about 9371.4203832717. The cubic root of 87823520 is about 444.4984797265.

The spelling of 87823520 in words is "eighty-seven million, eight hundred twenty-three thousand, five hundred twenty".