64512811 has 8 divisors (see below), whose sum is σ = 71875584. Its totient is φ = 57399720.

The previous prime is 64512737. The next prime is 64512821. The reversal of 64512811 is 11821546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64512811 - 2⁷ = 64512683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64512811.

It is not an unprimeable number, because it can be changed into a prime (64512821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61875 + ... + 62908.

It is an arithmetic number, because the mean of its divisors is an integer number (8984448).

Almost surely, 2^64512811 is an apocalyptic number.

64512811 is a deficient number, since it is larger than the sum of its proper divisors (7362773).

64512811 is a wasteful number, since it uses less digits than its factorization.

64512811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124841.

The product of its digits is 1920, while the sum is 28.

The square root of 64512811 is about 8031.9867405269. The cubic root of 64512811 is about 401.0655154220.

It can be divided in two parts, 645 and 12811, that added together give a square (13456 = 116²).

The spelling of 64512811 in words is "sixty-four million, five hundred twelve thousand, eight hundred eleven".