640846481 has 8 divisors (see below), whose sum is σ = 699371904. Its totient is φ = 582365520.

The previous prime is 640846463. The next prime is 640846483. The reversal of 640846481 is 184648046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 640846481 - 2¹⁴ = 640830097 is a prime.

It is a super-2 number, since 2×640846481² = 821368424420166722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640846483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23816 + ... + 42998.

It is an arithmetic number, because the mean of its divisors is an integer number (87421488).

Almost surely, 2^640846481 is an apocalyptic number.

It is an amenable number.

640846481 is a deficient number, since it is larger than the sum of its proper divisors (58525423).

640846481 is a wasteful number, since it uses less digits than its factorization.

640846481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22231.

The product of its (nonzero) digits is 147456, while the sum is 41.

The square root of 640846481 is about 25314.9458028257. The cubic root of 640846481 is about 862.1536436381.

The spelling of 640846481 in words is "six hundred forty million, eight hundred forty-six thousand, four hundred eighty-one".