51400000 has 84 divisors (see below), whose sum is σ = 127983996. Its totient is φ = 20480000.

The previous prime is 51399979. The next prime is 51400001. The reversal of 51400000 is 415.

It can be written as a sum of positive squares in 6 ways, for example, as 26956864 + 24443136 = 5192^2 + 4944^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a self number, because there is not a number n which added to its sum of digits gives 51400000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51400001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 199872 + ... + 200128.

It is an arithmetic number, because the mean of its divisors is an integer number (1523619).

Almost surely, 2^51400000 is an apocalyptic number.

51400000 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 51400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63991998).

51400000 is an abundant number, since it is smaller than the sum of its proper divisors (76583996).

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

51400000 is an frugal number, since it uses more digits than its factorization.

51400000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 51400000 is about 7169.3793315740. The cubic root of 51400000 is about 371.8099773328.

Adding to 51400000 its reverse (415), we get a palindrome (51400415).

The spelling of 51400000 in words is "fifty-one million, four hundred thousand".