64920188 has 12 divisors (see below), whose sum is σ = 119589960. Its totient is φ = 30751632.

The previous prime is 64920187. The next prime is 64920209. The reversal of 64920188 is 88102946.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64920187) 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 3 ways as a sum of consecutive naturals, for example, 427031 + ... + 427182.

It is an arithmetic number, because the mean of its divisors is an integer number (9965830).

Almost surely, 2^64920188 is an apocalyptic number.

It is an amenable number.

64920188 is a deficient number, since it is larger than the sum of its proper divisors (54669772).

64920188 is a wasteful number, since it uses less digits than its factorization.

64920188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854236 (or 854234 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 64920188 is about 8057.3064978316. The cubic root of 64920188 is about 401.9079432452.

The spelling of 64920188 in words is "sixty-four million, nine hundred twenty thousand, one hundred eighty-eight".