425720688 has 80 divisors (see below), whose sum is σ = 1164508800. Its totient is φ = 133643520.

The previous prime is 425720677. The next prime is 425720693. The reversal of 425720688 is 886027524.

It is a happy number.

It is a Cunningham number, because it is equal to 20633²-1.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163783 + ... + 166361.

It is an arithmetic number, because the mean of its divisors is an integer number (14556360).

Almost surely, 2^425720688 is an apocalyptic number.

425720688 is a gapful number since it is divisible by the number (48) 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 425720688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (582254400).

425720688 is an abundant number, since it is smaller than the sum of its proper divisors (738788112).

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

425720688 is a wasteful number, since it uses less digits than its factorization.

425720688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2790 (or 2784 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 425720688 is about 20632.9999757670. Note that the first 4 decimals coincide. The cubic root of 425720688 is about 752.2720364060.

The spelling of 425720688 in words is "four hundred twenty-five million, seven hundred twenty thousand, six hundred eighty-eight".