87821492 has 24 divisors (see below), whose sum is σ = 168279552. Its totient is φ = 39771200.

The previous prime is 87821491. The next prime is 87821509. The reversal of 87821492 is 29412878.

It is a super-2 number, since 2×87821492² = 15425228914212128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87821491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8813 + ... + 15915.

It is an arithmetic number, because the mean of its divisors is an integer number (7011648).

Almost surely, 2^87821492 is an apocalyptic number.

It is an amenable number.

87821492 is a deficient number, since it is larger than the sum of its proper divisors (80458060).

87821492 is a wasteful number, since it uses less digits than its factorization.

87821492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7399 (or 7397 counting only the distinct ones).

The product of its digits is 64512, while the sum is 41.

The square root of 87821492 is about 9371.3121813330. The cubic root of 87821492 is about 444.4950582821.

The spelling of 87821492 in words is "eighty-seven million, eight hundred twenty-one thousand, four hundred ninety-two".