64720206 has 24 divisors (see below), whose sum is σ = 146324880. Its totient is φ = 20635296.

The previous prime is 64720171. The next prime is 64720211. The reversal of 64720206 is 60202746.

It is a self number, because there is not a number n which added to its sum of digits gives 64720206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77751 + ... + 78578.

It is an arithmetic number, because the mean of its divisors is an integer number (6096870).

Almost surely, 2^64720206 is an apocalyptic number.

64720206 is an abundant number, since it is smaller than the sum of its proper divisors (81604674).

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

64720206 is a wasteful number, since it uses less digits than its factorization.

64720206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156360 (or 156357 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 64720206 is about 8044.8869476208. The cubic root of 64720206 is about 401.4948358721.

The spelling of 64720206 in words is "sixty-four million, seven hundred twenty thousand, two hundred six".