51015744 has 140 divisors (see below), whose sum is σ = 163074604. Its totient is φ = 15676416.

The previous prime is 51015721. The next prime is 51015749. The reversal of 51015744 is 44751015.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18662400 + 32353344 = 4320^2 + 5688^2 .

It is a super-2 number, since 2×51015744² = 5205212271747072, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51015749) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 67014 + ... + 67770.

Almost surely, 2^51015744 is an apocalyptic number.

51015744 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51015744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81537302).

51015744 is an abundant number, since it is smaller than the sum of its proper divisors (112058860).

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

51015744 is a wasteful number, since it uses less digits than its factorization.

51015744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794 (or 775 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 51015744 is about 7142.5306439665. The cubic root of 51015744 is about 370.8811334700.

Adding to 51015744 its reverse (44751015), we get a palindrome (95766759).

The spelling of 51015744 in words is "fifty-one million, fifteen thousand, seven hundred forty-four".