64772247 has 4 divisors (see below), whose sum is σ = 86363000. Its totient is φ = 43181496.

The previous prime is 64772231. The next prime is 64772249. The reversal of 64772247 is 74227746.

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

It is not a de Polignac number, because 64772247 - 2⁴ = 64772231 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 (64772249) 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, 10795372 + ... + 10795377.

It is an arithmetic number, because the mean of its divisors is an integer number (21590750).

Almost surely, 2^64772247 is an apocalyptic number.

64772247 is a deficient number, since it is larger than the sum of its proper divisors (21590753).

64772247 is a wasteful number, since it uses less digits than its factorization.

64772247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21590752.

The product of its digits is 131712, while the sum is 39.

The square root of 64772247 is about 8048.1207123154. The cubic root of 64772247 is about 401.6024199702.

The spelling of 64772247 in words is "sixty-four million, seven hundred seventy-two thousand, two hundred forty-seven".