87450021 has 12 divisors (see below), whose sum is σ = 126398220. Its totient is φ = 58262400.

The previous prime is 87450019. The next prime is 87450029. The reversal of 87450021 is 12005478.

It can be written as a sum of positive squares in 2 ways, for example, as 18792225 + 68657796 = 4335^2 + 8286^2 .

It is not a de Polignac number, because 87450021 - 2¹ = 87450019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87450029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23475 + ... + 26943.

It is an arithmetic number, because the mean of its divisors is an integer number (10533185).

Almost surely, 2^87450021 is an apocalyptic number.

It is an amenable number.

87450021 is a deficient number, since it is larger than the sum of its proper divisors (38948199).

87450021 is a wasteful number, since it uses less digits than its factorization.

87450021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6276 (or 6273 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 87450021 is about 9351.4715954228. The cubic root of 87450021 is about 443.8674580029.

Adding to 87450021 its reverse (12005478), we get a palindrome (99455499).

The spelling of 87450021 in words is "eighty-seven million, four hundred fifty thousand, twenty-one".