64889940 has 48 divisors (see below), whose sum is σ = 191257920. Its totient is φ = 16392960.

The previous prime is 64889917. The next prime is 64889963. The reversal of 64889940 is 4998846.

64889940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (64889917) and next prime (64889963).

It is a self number, because there is not a number n which added to its sum of digits gives 64889940.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 27321 + ... + 29600.

It is an arithmetic number, because the mean of its divisors is an integer number (3984540).

Almost surely, 2^64889940 is an apocalyptic number.

64889940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64889940 is an abundant number, since it is smaller than the sum of its proper divisors (126367980).

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

64889940 is a wasteful number, since it uses less digits than its factorization.

64889940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56952 (or 56950 counting only the distinct ones).

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

The square root of 64889940 is about 8055.4292250631. The cubic root of 64889940 is about 401.8455137688.

The spelling of 64889940 in words is "sixty-four million, eight hundred eighty-nine thousand, nine hundred forty".