64283991 has 4 divisors (see below), whose sum is σ = 85711992. Its totient is φ = 42855992.

The previous prime is 64283983. The next prime is 64283993. The reversal of 64283991 is 19938246.

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

It is a cyclic number.

It is not a de Polignac number, because 64283991 - 2³ = 64283983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64283993) 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, 10713996 + ... + 10714001.

It is an arithmetic number, because the mean of its divisors is an integer number (21427998).

Almost surely, 2^64283991 is an apocalyptic number.

64283991 is a deficient number, since it is larger than the sum of its proper divisors (21428001).

64283991 is a wasteful number, since it uses less digits than its factorization.

64283991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21428000.

The product of its digits is 93312, while the sum is 42.

The square root of 64283991 is about 8017.7297909071. The cubic root of 64283991 is about 400.5907749495.

The spelling of 64283991 in words is "sixty-four million, two hundred eighty-three thousand, nine hundred ninety-one".