64987812 has 48 divisors (see below), whose sum is σ = 170815680. Its totient is φ = 21363264.

The previous prime is 64987781. The next prime is 64987817. The reversal of 64987812 is 21878946.

It is not an unprimeable number, because it can be changed into a prime (64987817) 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, 3763 + ... + 12005.

It is an arithmetic number, because the mean of its divisors is an integer number (3558660).

Almost surely, 2^64987812 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 64987812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85407840).

64987812 is an abundant number, since it is smaller than the sum of its proper divisors (105827868).

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

64987812 is a wasteful number, since it uses less digits than its factorization.

64987812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8329 (or 8321 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 64987812 is about 8061.5018451899. The cubic root of 64987812 is about 402.0474437211.

The spelling of 64987812 in words is "sixty-four million, nine hundred eighty-seven thousand, eight hundred twelve".