64571340 has 48 divisors (see below), whose sum is σ = 181466208. Its totient is φ = 17155584.

The previous prime is 64571323. The next prime is 64571363. The reversal of 64571340 is 4317546.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 64571298 and 64571307.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15744 + ... + 19416.

It is an arithmetic number, because the mean of its divisors is an integer number (3780546).

Almost surely, 2^64571340 is an apocalyptic number.

64571340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64571340 is an abundant number, since it is smaller than the sum of its proper divisors (116894868).

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

64571340 is a wasteful number, since it uses less digits than its factorization.

64571340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3978 (or 3976 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 64571340 is about 8035.6294090756. The cubic root of 64571340 is about 401.1867671438.

Adding to 64571340 its reverse (4317546), we get a palindrome (68888886).

The spelling of 64571340 in words is "sixty-four million, five hundred seventy-one thousand, three hundred forty".