64489140 has 36 divisors (see below), whose sum is σ = 195617604. Its totient is φ = 17197056.

The previous prime is 64489129. The next prime is 64489151. The reversal of 64489140 is 4198446.

It is a happy number.

64489140 is a `hidden beast` number, since 644 + 8 + 9 + 1 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (64489129) and next prime (64489151).

It can be written as a sum of positive squares in 2 ways, for example, as 14107536 + 50381604 = 3756^2 + 7098^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 64489095 and 64489104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 178957 + ... + 179316.

Almost surely, 2^64489140 is an apocalyptic number.

64489140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64489140 is an abundant number, since it is smaller than the sum of its proper divisors (131128464).

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

64489140 is a wasteful number, since it uses less digits than its factorization.

64489140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358288 (or 358283 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 64489140 is about 8030.5130595747. The cubic root of 64489140 is about 401.0164565191.

The spelling of 64489140 in words is "sixty-four million, four hundred eighty-nine thousand, one hundred forty".