87470521 has 4 divisors (see below), whose sum is σ = 87615232. Its totient is φ = 87325812.

The previous prime is 87470497. The next prime is 87470533. The reversal of 87470521 is 12507478.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 87470521 - 2¹¹ = 87468473 is a prime.

It is a super-2 number, since 2×87470521² = 15302184088022882, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87470221) 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, 71445 + ... + 72658.

It is an arithmetic number, because the mean of its divisors is an integer number (21903808).

Almost surely, 2^87470521 is an apocalyptic number.

It is an amenable number.

87470521 is a deficient number, since it is larger than the sum of its proper divisors (144711).

87470521 is a wasteful number, since it uses less digits than its factorization.

87470521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144710.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 87470521 is about 9352.5676153664. The cubic root of 87470521 is about 443.9021390388.

Adding to 87470521 its reverse (12507478), we get a palindrome (99977999).

The spelling of 87470521 in words is "eighty-seven million, four hundred seventy thousand, five hundred twenty-one".