251223634284 has 96 divisors (see below), whose sum is σ = 699244041216. Its totient is φ = 68639028480.

The previous prime is 251223634273. The next prime is 251223634301. The reversal of 251223634284 is 482436322152.

It is a happy number.

It is a super-2 number, since 2×251223634284² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8216994 + ... + 8247510.

It is an arithmetic number, because the mean of its divisors is an integer number (7283792096).

Almost surely, 2^251223634284 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251223634284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (349622020608).

251223634284 is an abundant number, since it is smaller than the sum of its proper divisors (448020406932).

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

251223634284 is a wasteful number, since it uses less digits than its factorization.

251223634284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34815 (or 34813 counting only the distinct ones).

The product of its digits is 552960, while the sum is 42.

The spelling of 251223634284 in words is "two hundred fifty-one billion, two hundred twenty-three million, six hundred thirty-four thousand, two hundred eighty-four".