5213706640 has 20 divisors (see below), whose sum is σ = 12121868124. Its totient is φ = 2085482624.

The previous prime is 5213706637. The next prime is 5213706643. The reversal of 5213706640 is 466073125.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (5213706637) and next prime (5213706643).

It can be written as a sum of positive squares in 2 ways, for example, as 1008443536 + 4205263104 = 31756^2 + 64848^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 5213706596 and 5213706605.

It is not an unprimeable number, because it can be changed into a prime (5213706643) 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, 32585587 + ... + 32585746.

Almost surely, 2^5213706640 is an apocalyptic number.

It is an amenable number.

5213706640 is an abundant number, since it is smaller than the sum of its proper divisors (6908161484).

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

5213706640 is a wasteful number, since it uses less digits than its factorization.

5213706640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65171346 (or 65171340 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 5213706640 is about 72206.0014126250. The cubic root of 5213706640 is about 1733.9990838405. Note that the first 3 decimals are identical.

Adding to 5213706640 its reverse (466073125), we get a palindrome (5679779765).

The spelling of 5213706640 in words is "five billion, two hundred thirteen million, seven hundred six thousand, six hundred forty".