64849920 has 96 divisors (see below), whose sum is σ = 207567360. Its totient is φ = 17285120.

The previous prime is 64849871. The next prime is 64849973. The reversal of 64849920 is 2994846.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29665 + ... + 31775.

It is an arithmetic number, because the mean of its divisors is an integer number (2162160).

Almost surely, 2^64849920 is an apocalyptic number.

64849920 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 64849920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103783680).

64849920 is an abundant number, since it is smaller than the sum of its proper divisors (142717440).

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

64849920 is a wasteful number, since it uses less digits than its factorization.

64849920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2141 (or 2121 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 64849920 is about 8052.9448029898. The cubic root of 64849920 is about 401.7628858367.

The spelling of 64849920 in words is "sixty-four million, eight hundred forty-nine thousand, nine hundred twenty".