262640623212 has 144 divisors (see below), whose sum is σ = 727599704832. Its totient is φ = 79220903040.

The previous prime is 262640623199. The next prime is 262640623237. The reversal of 262640623212 is 212326046262.

262640623212 is a `hidden beast` number, since 2 + 6 + 2 + 6 + 4 + 0 + 623 + 21 + 2 = 666.

It is a super-2 number, since 2×262640623212² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 175913938 + ... + 175915430.

It is an arithmetic number, because the mean of its divisors is an integer number (5052775728).

Almost surely, 2^262640623212 is an apocalyptic number.

262640623212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 262640623212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (363799852416).

262640623212 is an abundant number, since it is smaller than the sum of its proper divisors (464959081620).

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

262640623212 is a wasteful number, since it uses less digits than its factorization.

262640623212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3268 (or 3263 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

Adding to 262640623212 its reverse (212326046262), we get a palindrome (474966669474).

The spelling of 262640623212 in words is "two hundred sixty-two billion, six hundred forty million, six hundred twenty-three thousand, two hundred twelve".