64672783 has 4 divisors (see below), whose sum is σ = 73911760. Its totient is φ = 55433808.

The previous prime is 64672771. The next prime is 64672793. The reversal of 64672783 is 38727646.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38727646 = 2 ⋅19363823.

It is a cyclic number.

It is not a de Polignac number, because 64672783 - 2¹³ = 64664591 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 (64672733) 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, 4619478 + ... + 4619491.

It is an arithmetic number, because the mean of its divisors is an integer number (18477940).

Almost surely, 2^64672783 is an apocalyptic number.

64672783 is a deficient number, since it is larger than the sum of its proper divisors (9238977).

64672783 is an equidigital number, since it uses as much as digits as its factorization.

64672783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9238976.

The product of its digits is 338688, while the sum is 43.

The square root of 64672783 is about 8041.9390074782. The cubic root of 64672783 is about 401.3967483085.

The spelling of 64672783 in words is "sixty-four million, six hundred seventy-two thousand, seven hundred eighty-three".