64405044 has 120 divisors (see below), whose sum is σ = 194660928. Its totient is φ = 18351360.

The previous prime is 64405031. The next prime is 64405057. The reversal of 64405044 is 44050446.

It is an interprime number because it is at equal distance from previous prime (64405031) and next prime (64405057).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 64404999 and 64405017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 60057 + ... + 61119.

Almost surely, 2^64405044 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 64405044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97330464).

64405044 is an abundant number, since it is smaller than the sum of its proper divisors (130255884).

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

64405044 is a wasteful number, since it uses less digits than its factorization.

64405044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107 (or 1096 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 64405044 is about 8025.2753223799. The cubic root of 64405044 is about 400.8420677276.

The spelling of 64405044 in words is "sixty-four million, four hundred five thousand, forty-four".