51642136 has 32 divisors (see below), whose sum is σ = 119175840. Its totient is φ = 20429568.

The previous prime is 51642119. The next prime is 51642139. The reversal of 51642136 is 63124615.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51642139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34741 + ... + 36196.

It is an arithmetic number, because the mean of its divisors is an integer number (3724245).

Almost surely, 2^51642136 is an apocalyptic number.

51642136 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51642136 is an abundant number, since it is smaller than the sum of its proper divisors (67533704).

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

51642136 is a wasteful number, since it uses less digits than its factorization.

51642136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70963 (or 70959 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 51642136 is about 7186.2463080526. The cubic root of 51642136 is about 372.3929058678.

The spelling of 51642136 in words is "fifty-one million, six hundred forty-two thousand, one hundred thirty-six".