51463644 has 12 divisors (see below), whose sum is σ = 120081864. Its totient is φ = 17154544.

The previous prime is 51463619. The next prime is 51463649. The reversal of 51463644 is 44636415.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51463649) 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, 2144307 + ... + 2144330.

It is an arithmetic number, because the mean of its divisors is an integer number (10006822).

Almost surely, 2^51463644 is an apocalyptic number.

It is an amenable number.

51463644 is an abundant number, since it is smaller than the sum of its proper divisors (68618220).

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

51463644 is a wasteful number, since it uses less digits than its factorization.

51463644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4288644 (or 4288642 counting only the distinct ones).

The product of its digits is 34560, while the sum is 33.

The square root of 51463644 is about 7173.8165574539. The cubic root of 51463644 is about 371.9633736630.

The spelling of 51463644 in words is "fifty-one million, four hundred sixty-three thousand, six hundred forty-four".