87511540 has 12 divisors (see below), whose sum is σ = 183774276. Its totient is φ = 35004608.

The previous prime is 87511519. The next prime is 87511561. The reversal of 87511540 is 4511578.

It is an interprime number because it is at equal distance from previous prime (87511519) and next prime (87511561).

It can be written as a sum of positive squares in 2 ways, for example, as 24880144 + 62631396 = 4988^2 + 7914^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2187769 + ... + 2187808.

It is an arithmetic number, because the mean of its divisors is an integer number (15314523).

Almost surely, 2^87511540 is an apocalyptic number.

It is an amenable number.

87511540 is an abundant number, since it is smaller than the sum of its proper divisors (96262736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87511540 is a wasteful number, since it uses less digits than its factorization.

87511540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4375586 (or 4375584 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 87511540 is about 9354.7602855445. The cubic root of 87511540 is about 443.9715169889.

The spelling of 87511540 in words is "eighty-seven million, five hundred eleven thousand, five hundred forty".