426865445640 has 128 divisors (see below), whose sum is σ = 1430834544000. Its totient is φ = 113194808064.

The previous prime is 426865445639. The next prime is 426865445647. The reversal of 426865445640 is 46544568624.

426865445640 is a `hidden beast` number, since 4 + 2 + 6 + 8 + 6 + 544 + 56 + 40 = 666.

It is a super-3 number, since 3×426865445640³ (a number of 36 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (426865445647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 910719 + ... + 1297358.

It is an arithmetic number, because the mean of its divisors is an integer number (11178394875).

Almost surely, 2^426865445640 is an apocalyptic number.

426865445640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

426865445640 is an abundant number, since it is smaller than the sum of its proper divisors (1003969098360).

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

426865445640 is a wasteful number, since it uses less digits than its factorization.

426865445640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2208276 (or 2208266 counting only the distinct ones).

The product of its (nonzero) digits is 22118400, while the sum is 54.

The spelling of 426865445640 in words is "four hundred twenty-six billion, eight hundred sixty-five million, four hundred forty-five thousand, six hundred forty".