51642236 has 6 divisors (see below), whose sum is σ = 90373920. Its totient is φ = 25821116.

The previous prime is 51642233. The next prime is 51642251. The reversal of 51642236 is 63224615.

It is a junction number, because it is equal to n+sod(n) for n = 51642199 and 51642208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51642233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6455276 + ... + 6455283.

It is an arithmetic number, because the mean of its divisors is an integer number (15062320).

Almost surely, 2^51642236 is an apocalyptic number.

It is an amenable number.

51642236 is a deficient number, since it is larger than the sum of its proper divisors (38731684).

51642236 is a wasteful number, since it uses less digits than its factorization.

51642236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12910563 (or 12910561 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

The square root of 51642236 is about 7186.2532657846. The cubic root of 51642236 is about 372.3931462352.

The spelling of 51642236 in words is "fifty-one million, six hundred forty-two thousand, two hundred thirty-six".