87643457 has 8 divisors (see below), whose sum is σ = 96558912. Its totient is φ = 78886000.

The previous prime is 87643433. The next prime is 87643459. The reversal of 87643457 is 75434678.

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 87643457 - 2⁸ = 87643201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87643459) 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, 38333 + ... + 40554.

It is an arithmetic number, because the mean of its divisors is an integer number (12069864).

Almost surely, 2^87643457 is an apocalyptic number.

It is an amenable number.

87643457 is a deficient number, since it is larger than the sum of its proper divisors (8915455).

87643457 is a wasteful number, since it uses less digits than its factorization.

87643457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78999.

The product of its digits is 564480, while the sum is 44.

The square root of 87643457 is about 9361.8084257263. The cubic root of 87643457 is about 444.1944894358.

It can be divided in two parts, 8764 and 3457, that added together give a palindrome (12221).

The spelling of 87643457 in words is "eighty-seven million, six hundred forty-three thousand, four hundred fifty-seven".