625121442 has 64 divisors (see below), whose sum is σ = 1518635520. Its totient is φ = 189032400.

The previous prime is 625121437. The next prime is 625121443. The reversal of 625121442 is 244121526.

625121442 is a `hidden beast` number, since 6 + 2 + 512 + 144 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (625121443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 409693 + ... + 411215.

It is an arithmetic number, because the mean of its divisors is an integer number (23728680).

Almost surely, 2^625121442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 625121442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (759317760).

625121442 is an abundant number, since it is smaller than the sum of its proper divisors (893514078).

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

625121442 is a wasteful number, since it uses less digits than its factorization.

625121442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2236 (or 2230 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 625121442 is about 25002.4287220262. The cubic root of 625121442 is about 855.0433465251.

Adding to 625121442 its reverse (244121526), we get a palindrome (869242968).

The spelling of 625121442 in words is "six hundred twenty-five million, one hundred twenty-one thousand, four hundred forty-two".