64890743 has 4 divisors (see below), whose sum is σ = 65266008. Its totient is φ = 64515480.

The previous prime is 64890731. The next prime is 64890799. The reversal of 64890743 is 34709846.

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-64890743 is a prime.

It is a super-4 number, since 4×64890743⁴ (a number of 32 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64890743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64890143) 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, 187373 + ... + 187718.

It is an arithmetic number, because the mean of its divisors is an integer number (16316502).

Almost surely, 2^64890743 is an apocalyptic number.

64890743 is a deficient number, since it is larger than the sum of its proper divisors (375265).

64890743 is a wasteful number, since it uses less digits than its factorization.

64890743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375264.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 64890743 is about 8055.4790670698. The cubic root of 64890743 is about 401.8471713479.

The spelling of 64890743 in words is "sixty-four million, eight hundred ninety thousand, seven hundred forty-three".