51625340 has 96 divisors (see below), whose sum is σ = 124467840. Its totient is φ = 17842176.

The previous prime is 51625297. The next prime is 51625391. The reversal of 51625340 is 4352615.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 532172 + ... + 532268.

It is an arithmetic number, because the mean of its divisors is an integer number (1296540).

Almost surely, 2^51625340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51625340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62233920).

51625340 is an abundant number, since it is smaller than the sum of its proper divisors (72842500).

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

51625340 is a wasteful number, since it uses less digits than its factorization.

51625340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 51625340 is about 7185.0775917870. The cubic root of 51625340 is about 372.3525293462.

Adding to 51625340 its reverse (4352615), we get a palindrome (55977955).

The spelling of 51625340 in words is "fifty-one million, six hundred twenty-five thousand, three hundred forty".