64869816 has 32 divisors (see below), whose sum is σ = 176918400. Its totient is φ = 19657440.

The previous prime is 64869811. The next prime is 64869853. The reversal of 64869816 is 61896846.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64869811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122596 + ... + 123123.

It is an arithmetic number, because the mean of its divisors is an integer number (5528700).

Almost surely, 2^64869816 is an apocalyptic number.

64869816 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

64869816 is an abundant number, since it is smaller than the sum of its proper divisors (112048584).

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

64869816 is a wasteful number, since it uses less digits than its factorization.

64869816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245739 (or 245735 counting only the distinct ones).

The product of its digits is 497664, while the sum is 48.

The square root of 64869816 is about 8054.1800327532. The cubic root of 64869816 is about 401.8039686786.

The spelling of 64869816 in words is "sixty-four million, eight hundred sixty-nine thousand, eight hundred sixteen".