51664530 has 96 divisors (see below), whose sum is σ = 135276480. Its totient is φ = 12620800.

The previous prime is 51664523. The next prime is 51664537. The reversal of 51664530 is 3546615.

It is an interprime number because it is at equal distance from previous prime (51664523) and next prime (51664537).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (51664537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 511480 + ... + 511580.

It is an arithmetic number, because the mean of its divisors is an integer number (1409130).

Almost surely, 2^51664530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51664530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67638240).

51664530 is an abundant number, since it is smaller than the sum of its proper divisors (83611950).

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

51664530 is a wasteful number, since it uses less digits than its factorization.

51664530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 51664530 is about 7187.8042544299. The cubic root of 51664530 is about 372.4467260119.

The spelling of 51664530 in words is "fifty-one million, six hundred sixty-four thousand, five hundred thirty".