215800641 has 48 divisors (see below), whose sum is σ = 375717888. Its totient is φ = 116748000.

The previous prime is 215800633. The next prime is 215800643. The reversal of 215800641 is 146008512.

215800641 is a `hidden beast` number, since 2 + 15 + 8 + 0 + 0 + 641 = 666.

It is not a de Polignac number, because 215800641 - 2³ = 215800633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215800643) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 90616 + ... + 92966.

It is an arithmetic number, because the mean of its divisors is an integer number (7827456).

Almost surely, 2^215800641 is an apocalyptic number.

215800641 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

215800641 is a deficient number, since it is larger than the sum of its proper divisors (159917247).

215800641 is a wasteful number, since it uses less digits than its factorization.

215800641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2442 (or 2439 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 215800641 is about 14690.1545601127. The cubic root of 215800641 is about 599.8153515141.

The spelling of 215800641 in words is "two hundred fifteen million, eight hundred thousand, six hundred forty-one".