87644263 has 8 divisors (see below), whose sum is σ = 101291040. Its totient is φ = 74279040.

The previous prime is 87644261. The next prime is 87644273. The reversal of 87644263 is 36244678.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87644263 - 2¹ = 87644261 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 (87644261) 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, 69718 + ... + 70963.

It is an arithmetic number, because the mean of its divisors is an integer number (12661380).

Almost surely, 2^87644263 is an apocalyptic number.

87644263 is a deficient number, since it is larger than the sum of its proper divisors (13646777).

87644263 is a wasteful number, since it uses less digits than its factorization.

87644263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140777.

The product of its digits is 193536, while the sum is 40.

The square root of 87644263 is about 9361.8514728658. The cubic root of 87644263 is about 444.1958510877.

The spelling of 87644263 in words is "eighty-seven million, six hundred forty-four thousand, two hundred sixty-three".