425040640 has 72 divisors (see below), whose sum is σ = 1071750960. Its totient is φ = 161058816.

The previous prime is 425040631. The next prime is 425040641. The reversal of 425040640 is 46040524.

It is not an unprimeable number, because it can be changed into a prime (425040641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15582 + ... + 33058.

It is an arithmetic number, because the mean of its divisors is an integer number (14885430).

Almost surely, 2^425040640 is an apocalyptic number.

425040640 is a gapful number since it is divisible by the number (40) 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 425040640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (535875480).

425040640 is an abundant number, since it is smaller than the sum of its proper divisors (646710320).

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

425040640 is a wasteful number, since it uses less digits than its factorization.

425040640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17517 (or 17503 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 425040640 is about 20616.5137693064. The cubic root of 425040640 is about 751.8712621027.

The spelling of 425040640 in words is "four hundred twenty-five million, forty thousand, six hundred forty".