212610640 has 40 divisors (see below), whose sum is σ = 539260128. Its totient is φ = 77312640.

The previous prime is 212610637. The next prime is 212610641. The reversal of 212610640 is 46016212.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212610641) 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, 119922 + ... + 121681.

Almost surely, 2^212610640 is an apocalyptic number.

212610640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212610640 is an abundant number, since it is smaller than the sum of its proper divisors (326649488).

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

212610640 is a wasteful number, since it uses less digits than its factorization.

212610640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241627 (or 241621 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 212610640 is about 14581.1741639691. The cubic root of 212610640 is about 596.8451442537.

Adding to 212610640 its reverse (46016212), we get a palindrome (258626852).

The spelling of 212610640 in words is "two hundred twelve million, six hundred ten thousand, six hundred forty".