64397240 has 32 divisors (see below), whose sum is σ = 151195680. Its totient is φ = 24638592.

The previous prime is 64397189. The next prime is 64397243. The reversal of 64397240 is 4279346.

It is a self number, because there is not a number n which added to its sum of digits gives 64397240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64397243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34079 + ... + 35918.

It is an arithmetic number, because the mean of its divisors is an integer number (4724865).

Almost surely, 2^64397240 is an apocalyptic number.

It is an amenable number.

64397240 is an abundant number, since it is smaller than the sum of its proper divisors (86798440).

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

64397240 is a wasteful number, since it uses less digits than its factorization.

64397240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70031 (or 70027 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 64397240 is about 8024.7890938018. The cubic root of 64397240 is about 400.8258769778.

The spelling of 64397240 in words is "sixty-four million, three hundred ninety-seven thousand, two hundred forty".