64280993 has 6 divisors (see below), whose sum is σ = 74775906. Its totient is φ = 55097952.

The previous prime is 64280969. The next prime is 64281013. The reversal of 64280993 is 39908246.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 35904064 + 28376929 = 5992^2 + 5327^2 .

It is not a de Polignac number, because 64280993 - 2⁸ = 64280737 is a prime.

It is a super-2 number, since 2×64280993² = 8264092122132098, which contains 22 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 64280993.

It is not an unprimeable number, because it can be changed into a prime (64280963) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 655880 + ... + 655977.

It is an arithmetic number, because the mean of its divisors is an integer number (12462651).

Almost surely, 2^64280993 is an apocalyptic number.

It is an amenable number.

64280993 is a deficient number, since it is larger than the sum of its proper divisors (10494913).

64280993 is a wasteful number, since it uses less digits than its factorization.

64280993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311871 (or 1311864 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 64280993 is about 8017.5428280739. The cubic root of 64280993 is about 400.5845474280.

The spelling of 64280993 in words is "sixty-four million, two hundred eighty thousand, nine hundred ninety-three".