64678540 has 48 divisors (see below), whose sum is σ = 144746784. Its totient is φ = 24192000.

The previous prime is 64678519. The next prime is 64678543. The reversal of 64678540 is 4587646.

It is a junction number, because it is equal to n+sod(n) for n = 64678493 and 64678502.

It is not an unprimeable number, because it can be changed into a prime (64678543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61015 + ... + 62065.

It is an arithmetic number, because the mean of its divisors is an integer number (3015558).

Almost surely, 2^64678540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64678540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72373392).

64678540 is an abundant number, since it is smaller than the sum of its proper divisors (80068244).

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

64678540 is a wasteful number, since it uses less digits than its factorization.

64678540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258 (or 1256 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 64678540 is about 8042.2969355775. The cubic root of 64678540 is about 401.4086583805.

The spelling of 64678540 in words is "sixty-four million, six hundred seventy-eight thousand, five hundred forty".