87144641 has 4 divisors (see below), whose sum is σ = 87168432. Its totient is φ = 87120852.

The previous prime is 87144637. The next prime is 87144643. The reversal of 87144641 is 14644178.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87144641 - 2² = 87144637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87144643) 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, 5111 + ... + 14156.

It is an arithmetic number, because the mean of its divisors is an integer number (21792108).

Almost surely, 2^87144641 is an apocalyptic number.

It is an amenable number.

87144641 is a deficient number, since it is larger than the sum of its proper divisors (23791).

87144641 is a wasteful number, since it uses less digits than its factorization.

87144641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23790.

The product of its digits is 21504, while the sum is 35.

The square root of 87144641 is about 9335.1294045664. The cubic root of 87144641 is about 443.3501860416.

The spelling of 87144641 in words is "eighty-seven million, one hundred forty-four thousand, six hundred forty-one".