2051687400 has 384 divisors, whose sum is σ = 7722362880. Its totient is φ = 440478720.

The previous prime is 2051687387. The next prime is 2051687401. The reversal of 2051687400 is 47861502.

It is not an unprimeable number, because it can be changed into a prime (2051687401) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6472042 + ... + 6472358.

It is an arithmetic number, because the mean of its divisors is an integer number (20110320).

Almost surely, 2^2051687400 is an apocalyptic number.

2051687400 is a gapful number since it is divisible by the number (20) 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 2051687400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3861181440).

2051687400 is an abundant number, since it is smaller than the sum of its proper divisors (5670675480).

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

2051687400 is a wasteful number, since it uses less digits than its factorization.

2051687400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433 (or 424 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 2051687400 is about 45295.5560734163. The cubic root of 2051687400 is about 1270.6825438098.

The spelling of 2051687400 in words is "two billion, fifty-one million, six hundred eighty-seven thousand, four hundred".