51389736 has 32 divisors (see below), whose sum is σ = 128882400. Its totient is φ = 17075520.

The previous prime is 51389731. The next prime is 51389743. The reversal of 51389736 is 63798315.

It is a super-2 number, since 2×51389736² = 5281809932299392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51389731) 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, 4710 + ... + 11178.

It is an arithmetic number, because the mean of its divisors is an integer number (4027575).

Almost surely, 2^51389736 is an apocalyptic number.

It is an amenable number.

51389736 is an abundant number, since it is smaller than the sum of its proper divisors (77492664).

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

51389736 is a wasteful number, since it uses less digits than its factorization.

51389736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6809 (or 6805 counting only the distinct ones).

The product of its digits is 136080, while the sum is 42.

The square root of 51389736 is about 7168.6634737585. The cubic root of 51389736 is about 371.7852269329.

It can be divided in two parts, 51389 and 736, that added together give a palindrome (52125).

The spelling of 51389736 in words is "fifty-one million, three hundred eighty-nine thousand, seven hundred thirty-six".