64780199 has 4 divisors (see below), whose sum is σ = 70669320. Its totient is φ = 58891080.

The previous prime is 64780193. The next prime is 64780201. The reversal of 64780199 is 99108746.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64780199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64780193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2944544 + ... + 2944565.

It is an arithmetic number, because the mean of its divisors is an integer number (17667330).

Almost surely, 2^64780199 is an apocalyptic number.

64780199 is a deficient number, since it is larger than the sum of its proper divisors (5889121).

64780199 is a wasteful number, since it uses less digits than its factorization.

64780199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5889120.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 64780199 is about 8048.6147255289. The cubic root of 64780199 is about 401.6188540239.

The spelling of 64780199 in words is "sixty-four million, seven hundred eighty thousand, one hundred ninety-nine".