426640578 has 64 divisors (see below), whose sum is σ = 1056706560. Its totient is φ = 111822912.

The previous prime is 426640567. The next prime is 426640583. The reversal of 426640578 is 875046624.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88843 + ... + 93521.

It is an arithmetic number, because the mean of its divisors is an integer number (16511040).

Almost surely, 2^426640578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 426640578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (528353280).

426640578 is an abundant number, since it is smaller than the sum of its proper divisors (630065982).

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

426640578 is a wasteful number, since it uses less digits than its factorization.

426640578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4871.

The product of its (nonzero) digits is 322560, while the sum is 42.

The square root of 426640578 is about 20655.2796640472. The cubic root of 426640578 is about 752.8134788075.

It can be divided in two parts, 4266 and 40578, that added together give a palindrome (44844).

The spelling of 426640578 in words is "four hundred twenty-six million, six hundred forty thousand, five hundred seventy-eight".