64821388 has 12 divisors (see below), whose sum is σ = 119407960. Its totient is φ = 30704832.

The previous prime is 64821377. The next prime is 64821401. The reversal of 64821388 is 88312846.

64821388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 64821388.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426381 + ... + 426532.

Almost surely, 2^64821388 is an apocalyptic number.

It is an amenable number.

64821388 is a deficient number, since it is larger than the sum of its proper divisors (54586572).

64821388 is a wasteful number, since it uses less digits than its factorization.

64821388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852936 (or 852934 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The square root of 64821388 is about 8051.1730822285. The cubic root of 64821388 is about 401.7039560276.

The spelling of 64821388 in words is "sixty-four million, eight hundred twenty-one thousand, three hundred eighty-eight".