64983780 has 144 divisors (see below), whose sum is σ = 208353600. Its totient is φ = 16369920.

The previous prime is 64983773. The next prime is 64983827. The reversal of 64983780 is 8738946.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 307875 + ... + 308085.

It is an arithmetic number, because the mean of its divisors is an integer number (1446900).

Almost surely, 2^64983780 is an apocalyptic number.

64983780 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 64983780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104176800).

64983780 is an abundant number, since it is smaller than the sum of its proper divisors (143369820).

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

64983780 is a wasteful number, since it uses less digits than its factorization.

64983780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 64983780 is about 8061.2517638392. The cubic root of 64983780 is about 402.0391288860.

The spelling of 64983780 in words is "sixty-four million, nine hundred eighty-three thousand, seven hundred eighty".