87074821 has 4 divisors (see below), whose sum is σ = 87094444. Its totient is φ = 87055200.

The previous prime is 87074797. The next prime is 87074831. The reversal of 87074821 is 12847078.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39312900 + 47761921 = 6270^2 + 6911^2 .

It is a cyclic number.

It is not a de Polignac number, because 87074821 - 2⁵ = 87074789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87074831) 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, 361 + ... + 13201.

It is an arithmetic number, because the mean of its divisors is an integer number (21773611).

Almost surely, 2^87074821 is an apocalyptic number.

It is an amenable number.

87074821 is a deficient number, since it is larger than the sum of its proper divisors (19623).

87074821 is a wasteful number, since it uses less digits than its factorization.

87074821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19622.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 87074821 is about 9331.3890177186. The cubic root of 87074821 is about 443.2317508353.

The spelling of 87074821 in words is "eighty-seven million, seventy-four thousand, eight hundred twenty-one".