812777064 has 64 divisors (see below), whose sum is σ = 2227322880. Its totient is φ = 245112000.

The previous prime is 812777057. The next prime is 812777081. The reversal of 812777064 is 460777218.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48409 + ... + 62999.

It is an arithmetic number, because the mean of its divisors is an integer number (34801920).

Almost surely, 2^812777064 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 812777064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1113661440).

812777064 is an abundant number, since it is smaller than the sum of its proper divisors (1414545816).

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

812777064 is a wasteful number, since it uses less digits than its factorization.

812777064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14822 (or 14818 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 42.

The square root of 812777064 is about 28509.2452372910. The cubic root of 812777064 is about 933.2338432500.

The spelling of 812777064 in words is "eight hundred twelve million, seven hundred seventy-seven thousand, sixty-four".