64426880 has 128 divisors (see below), whose sum is σ = 179340480. Its totient is φ = 21676032.

The previous prime is 64426871. The next prime is 64426883. The reversal of 64426880 is 8862446.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64426883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 326942 + ... + 327138.

Almost surely, 2^64426880 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64426880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89670240).

64426880 is an abundant number, since it is smaller than the sum of its proper divisors (114913600).

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

64426880 is a wasteful number, since it uses less digits than its factorization.

64426880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 64426880 is about 8026.6356588548. The cubic root of 64426880 is about 400.8873633434.

The spelling of 64426880 in words is "sixty-four million, four hundred twenty-six thousand, eight hundred eighty".