64407840 has 192 divisors, whose sum is σ = 240226560. Its totient is φ = 14192640.

The previous prime is 64407829. The next prime is 64407841. The reversal of 64407840 is 4870446.

It is not an unprimeable number, because it can be changed into a prime (64407841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 97110 + ... + 97770.

It is an arithmetic number, because the mean of its divisors is an integer number (1251180).

Almost surely, 2^64407840 is an apocalyptic number.

64407840 is a gapful number since it is divisible by the number (60) 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 64407840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120113280).

64407840 is an abundant number, since it is smaller than the sum of its proper divisors (175818720).

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

64407840 is a wasteful number, since it uses less digits than its factorization.

64407840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715 (or 707 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 64407840 is about 8025.4495201204. The cubic root of 64407840 is about 400.8478681956.

The spelling of 64407840 in words is "sixty-four million, four hundred seven thousand, eight hundred forty".