87720357 has 16 divisors (see below), whose sum is σ = 124483392. Its totient is φ = 54754560.

The previous prime is 87720343. The next prime is 87720371. The reversal of 87720357 is 75302778.

It is an interprime number because it is at equal distance from previous prime (87720343) and next prime (87720371).

It is not a de Polignac number, because 87720357 - 2⁴ = 87720341 is a prime.

It is a super-2 number, since 2×87720357² = 15389722064414898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87720307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5682 + ... + 14412.

It is an arithmetic number, because the mean of its divisors is an integer number (7780212).

Almost surely, 2^87720357 is an apocalyptic number.

It is an amenable number.

87720357 is a deficient number, since it is larger than the sum of its proper divisors (36763035).

87720357 is a wasteful number, since it uses less digits than its factorization.

87720357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8948.

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

The square root of 87720357 is about 9365.9146376635. The cubic root of 87720357 is about 444.3243662945.

The spelling of 87720357 in words is "eighty-seven million, seven hundred twenty thousand, three hundred fifty-seven".