51642330 has 32 divisors (see below), whose sum is σ = 128217600. Its totient is φ = 13296192.

The previous prime is 51642319. The next prime is 51642341. The reversal of 51642330 is 3324615.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51642319) and next prime (51642341).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51642330.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28810 + ... + 30549.

It is an arithmetic number, because the mean of its divisors is an integer number (4006800).

Almost surely, 2^51642330 is an apocalyptic number.

51642330 is an abundant number, since it is smaller than the sum of its proper divisors (76575270).

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

51642330 is a wasteful number, since it uses less digits than its factorization.

51642330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59398.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 51642330 is about 7186.2598060465. The cubic root of 51642330 is about 372.3933721804.

Adding to 51642330 its reverse (3324615), we get a palindrome (54966945).

The spelling of 51642330 in words is "fifty-one million, six hundred forty-two thousand, three hundred thirty".