213400062640 has 40 divisors (see below), whose sum is σ = 496179648720. Its totient is φ = 85355809536.

The previous prime is 213400062581. The next prime is 213400062691. The reversal of 213400062640 is 46260004312.

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

It is a junction number, because it is equal to n+sod(n) for n = 213400062599 and 213400062608.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1945747 + ... + 2052493.

It is an arithmetic number, because the mean of its divisors is an integer number (12404491218).

Almost surely, 2^213400062640 is an apocalyptic number.

213400062640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213400062640 is an abundant number, since it is smaller than the sum of its proper divisors (282779586080).

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

213400062640 is a wasteful number, since it uses less digits than its factorization.

213400062640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131749 (or 131743 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 213400062640 its reverse (46260004312), we get a palindrome (259660066952).

The spelling of 213400062640 in words is "two hundred thirteen billion, four hundred million, sixty-two thousand, six hundred forty".