51023700 has 324 divisors, whose sum is σ = 202604220. Its totient is φ = 10644480.

The previous prime is 51023659. The next prime is 51023701. The reversal of 51023700 is 732015.

It can be written as a sum of positive squares in 6 ways, for example, as 11861136 + 39162564 = 3444^2 + 6258^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51023701) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 573256 + ... + 573344.

Almost surely, 2^51023700 is an apocalyptic number.

51023700 is a gapful number since it is divisible by the number (50) 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 51023700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101302110).

51023700 is an abundant number, since it is smaller than the sum of its proper divisors (151580520).

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

51023700 is a wasteful number, since it uses less digits than its factorization.

51023700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 51023700 is about 7143.0875677119. The cubic root of 51023700 is about 370.9004123349.

Adding to 51023700 its reverse (732015), we get a palindrome (51755715).

The spelling of 51023700 in words is "fifty-one million, twenty-three thousand, seven hundred".