87528981 has 4 divisors (see below), whose sum is σ = 116705312. Its totient is φ = 58352652.

The previous prime is 87528979. The next prime is 87528983. The reversal of 87528981 is 18982578.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (87528979) and next prime (87528983).

It is not a de Polignac number, because 87528981 - 2¹ = 87528979 is a prime.

It is a super-2 number, since 2×87528981² = 15322645029796722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87528981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87528983) 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, 14588161 + ... + 14588166.

It is an arithmetic number, because the mean of its divisors is an integer number (29176328).

Almost surely, 2^87528981 is an apocalyptic number.

It is an amenable number.

87528981 is a deficient number, since it is larger than the sum of its proper divisors (29176331).

87528981 is a wasteful number, since it uses less digits than its factorization.

87528981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29176330.

The product of its digits is 322560, while the sum is 48.

The square root of 87528981 is about 9355.6924382966. The cubic root of 87528981 is about 444.0010094531.

The spelling of 87528981 in words is "eighty-seven million, five hundred twenty-eight thousand, nine hundred eighty-one".