51064644 has 12 divisors (see below), whose sum is σ = 119150864. Its totient is φ = 17021544.

The previous prime is 51064631. The next prime is 51064649. The reversal of 51064644 is 44646015.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (51064649) 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, 2127682 + ... + 2127705.

Almost surely, 2^51064644 is an apocalyptic number.

It is an amenable number.

51064644 is an abundant number, since it is smaller than the sum of its proper divisors (68086220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51064644 is a wasteful number, since it uses less digits than its factorization.

51064644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4255394 (or 4255392 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 51064644 is about 7145.9529805338. The cubic root of 51064644 is about 370.9995955658. Note that the first 3 decimals are identical.

The spelling of 51064644 in words is "fifty-one million, sixty-four thousand, six hundred forty-four".