425540640 has 192 divisors, whose sum is σ = 1569818880. Its totient is φ = 94863360.

The previous prime is 425540623. The next prime is 425540653. The reversal of 425540640 is 46045524.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 425540598 and 425540607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136216 + ... + 139304.

It is an arithmetic number, because the mean of its divisors is an integer number (8176140).

Almost surely, 2^425540640 is an apocalyptic number.

425540640 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 425540640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (784909440).

425540640 is an abundant number, since it is smaller than the sum of its proper divisors (1144278240).

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

425540640 is a wasteful number, since it uses less digits than its factorization.

425540640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3155 (or 3147 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 425540640 is about 20628.6364067042. The cubic root of 425540640 is about 752.1659698556.

The spelling of 425540640 in words is "four hundred twenty-five million, five hundred forty thousand, six hundred forty".