425640744 has 96 divisors (see below), whose sum is σ = 1200719520. Its totient is φ = 141258816.

The previous prime is 425640727. The next prime is 425640767. The reversal of 425640744 is 447046524.

425640744 is a `hidden beast` number, since 4 + 2 + 5 + 640 + 7 + 4 + 4 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 425640699 and 425640708.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 724819 + ... + 725405.

It is an arithmetic number, because the mean of its divisors is an integer number (12507495).

Almost surely, 2^425640744 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 425640744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (600359760).

425640744 is an abundant number, since it is smaller than the sum of its proper divisors (775078776).

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

425640744 is a wasteful number, since it uses less digits than its factorization.

425640744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981 (or 965 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 36.

The square root of 425640744 is about 20631.0625998759. The cubic root of 425640744 is about 752.2249449662.

The spelling of 425640744 in words is "four hundred twenty-five million, six hundred forty thousand, seven hundred forty-four".