64800749 has 4 divisors (see below), whose sum is σ = 69785436. Its totient is φ = 59816064.

The previous prime is 64800739. The next prime is 64800767. The reversal of 64800749 is 94700846.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19669225 + 45131524 = 4435^2 + 6718^2 .

It is a cyclic number.

It is not a de Polignac number, because 64800749 - 2¹² = 64796653 is a prime.

It is a super-2 number, since 2×64800749² = 8398274141922002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64800739) 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, 2492324 + ... + 2492349.

It is an arithmetic number, because the mean of its divisors is an integer number (17446359).

Almost surely, 2^64800749 is an apocalyptic number.

It is an amenable number.

64800749 is a deficient number, since it is larger than the sum of its proper divisors (4984687).

64800749 is a wasteful number, since it uses less digits than its factorization.

64800749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4984686.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 64800749 is about 8049.8912415013. The cubic root of 64800749 is about 401.6613175905.

The spelling of 64800749 in words is "sixty-four million, eight hundred thousand, seven hundred forty-nine".