87446991 has 4 divisors (see below), whose sum is σ = 116595992. Its totient is φ = 58297992.

The previous prime is 87446951. The next prime is 87446999. The reversal of 87446991 is 19964478.

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

It is not a de Polignac number, because 87446991 - 2⁹ = 87446479 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87446991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87446999) 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, 14574496 + ... + 14574501.

It is an arithmetic number, because the mean of its divisors is an integer number (29148998).

Almost surely, 2^87446991 is an apocalyptic number.

87446991 is a deficient number, since it is larger than the sum of its proper divisors (29149001).

87446991 is a wasteful number, since it uses less digits than its factorization.

87446991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29149000.

The product of its digits is 435456, while the sum is 48.

The square root of 87446991 is about 9351.3095874321. The cubic root of 87446991 is about 443.8623315169.

The spelling of 87446991 in words is "eighty-seven million, four hundred forty-six thousand, nine hundred ninety-one".