87720508 has 12 divisors (see below), whose sum is σ = 153658512. Its totient is φ = 43818080.

The previous prime is 87720499. The next prime is 87720509. The reversal of 87720508 is 80502778.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87720509) 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, 5608 + ... + 14383.

It is an arithmetic number, because the mean of its divisors is an integer number (12804876).

Almost surely, 2^87720508 is an apocalyptic number.

It is an amenable number.

87720508 is a deficient number, since it is larger than the sum of its proper divisors (65938004).

87720508 is a wasteful number, since it uses less digits than its factorization.

87720508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21092 (or 21090 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 37.

The square root of 87720508 is about 9365.9226988055. The cubic root of 87720508 is about 444.3246212446.

The spelling of 87720508 in words is "eighty-seven million, seven hundred twenty thousand, five hundred eight".