64893540 has 96 divisors (see below), whose sum is σ = 189665280. Its totient is φ = 16560000.

The previous prime is 64893497. The next prime is 64893551. The reversal of 64893540 is 4539846.

64893540 = 383² + 384² + ... + 630².

It is a super-2 number, since 2×64893540² = 8422343067463200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 258415 + ... + 258665.

It is an arithmetic number, because the mean of its divisors is an integer number (1975680).

Almost surely, 2^64893540 is an apocalyptic number.

64893540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64893540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94832640).

64893540 is an abundant number, since it is smaller than the sum of its proper divisors (124771740).

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

64893540 is a wasteful number, since it uses less digits than its factorization.

64893540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 64893540 is about 8055.6526737441. The cubic root of 64893540 is about 401.8529449007.

The spelling of 64893540 in words is "sixty-four million, eight hundred ninety-three thousand, five hundred forty".