87773520 has 80 divisors (see below), whose sum is σ = 283946112. Its totient is φ = 22387200.

The previous prime is 87773507. The next prime is 87773531. The reversal of 87773520 is 2537778.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2431 + ... + 13470.

Almost surely, 2^87773520 is an apocalyptic number.

87773520 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 87773520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141973056).

87773520 is an abundant number, since it is smaller than the sum of its proper divisors (196172592).

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

87773520 is a wasteful number, since it uses less digits than its factorization.

87773520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15940 (or 15934 counting only the distinct ones).

The product of its (nonzero) digits is 82320, while the sum is 39.

The square root of 87773520 is about 9368.7523182119. The cubic root of 87773520 is about 444.4141092258.

The spelling of 87773520 in words is "eighty-seven million, seven hundred seventy-three thousand, five hundred twenty".