64873040 has 20 divisors (see below), whose sum is σ = 150830004. Its totient is φ = 25949184.

The previous prime is 64873033. The next prime is 64873069. The reversal of 64873040 is 4037846.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 31047184 + 33825856 = 5572^2 + 5816^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×64873040² = 8417022637683200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64872988 and 64873006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405377 + ... + 405536.

Almost surely, 2^64873040 is an apocalyptic number.

It is an amenable number.

64873040 is an abundant number, since it is smaller than the sum of its proper divisors (85956964).

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

64873040 is a wasteful number, since it uses less digits than its factorization.

64873040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810926 (or 810920 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 64873040 is about 8054.3801747869. The cubic root of 64873040 is about 401.8106250591.

The spelling of 64873040 in words is "sixty-four million, eight hundred seventy-three thousand, forty".