87491524 has 6 divisors (see below), whose sum is σ = 153110174. Its totient is φ = 43745760.

The previous prime is 87491519. The next prime is 87491527. The reversal of 87491524 is 42519478.

It can be written as a sum of positive squares in only one way, i.e., 77757124 + 9734400 = 8818^2 + 3120^2 .

It is not an unprimeable number, because it can be changed into a prime (87491527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10936437 + ... + 10936444.

Almost surely, 2^87491524 is an apocalyptic number.

It is an amenable number.

87491524 is a deficient number, since it is larger than the sum of its proper divisors (65618650).

87491524 is a wasteful number, since it uses less digits than its factorization.

87491524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21872885 (or 21872883 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 87491524 is about 9353.6903947052. The cubic root of 87491524 is about 443.9376654097.

Adding to 87491524 its product of digits (80640), we get a square (87572164 = 9358²).

The spelling of 87491524 in words is "eighty-seven million, four hundred ninety-one thousand, five hundred twenty-four".