87555553 has 16 divisors (see below), whose sum is σ = 96148800. Its totient is φ = 79410240.

The previous prime is 87555547. The next prime is 87555569. The reversal of 87555553 is 35555578.

It is a cyclic number.

It is not a de Polignac number, because 87555553 - 2⁵ = 87555521 is a prime.

It is a super-2 number, since 2×87555553² = 15331949722271618, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (87555053) 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, 71575 + ... + 72787.

It is an arithmetic number, because the mean of its divisors is an integer number (6009300).

Almost surely, 2^87555553 is an apocalyptic number.

It is an amenable number.

87555553 is a deficient number, since it is larger than the sum of its proper divisors (8593247).

87555553 is a wasteful number, since it uses less digits than its factorization.

87555553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392.

The product of its digits is 525000, while the sum is 43.

The square root of 87555553 is about 9357.1124285220. The cubic root of 87555553 is about 444.0459347682.

The spelling of 87555553 in words is "eighty-seven million, five hundred fifty-five thousand, five hundred fifty-three".