210864540 has 24 divisors (see below), whose sum is σ = 590420880. Its totient is φ = 56230528.

The previous prime is 210864523. The next prime is 210864541. The reversal of 210864540 is 45468012.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 210864498 and 210864507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210864541) 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, 1757145 + ... + 1757264.

It is an arithmetic number, because the mean of its divisors is an integer number (24600870).

Almost surely, 2^210864540 is an apocalyptic number.

210864540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210864540 is an abundant number, since it is smaller than the sum of its proper divisors (379556340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

210864540 is a wasteful number, since it uses less digits than its factorization.

210864540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3514421 (or 3514419 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 210864540 is about 14521.1755722462. The cubic root of 210864540 is about 595.2067544072.

The spelling of 210864540 in words is "two hundred ten million, eight hundred sixty-four thousand, five hundred forty".