2051387688 has 128 divisors (see below), whose sum is σ = 6254392320. Its totient is φ = 547322880.

The previous prime is 2051387683. The next prime is 2051387711. The reversal of 2051387688 is 8867831502.

It is not an unprimeable number, because it can be changed into a prime (2051387683) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 371395 + ... + 376877.

It is an arithmetic number, because the mean of its divisors is an integer number (48862440).

Almost surely, 2^2051387688 is an apocalyptic number.

2051387688 is a gapful number since it is divisible by the number (28) 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 2051387688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3127196160).

2051387688 is an abundant number, since it is smaller than the sum of its proper divisors (4203004632).

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

2051387688 is a wasteful number, since it uses less digits than its factorization.

2051387688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5647 (or 5643 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 48.

The square root of 2051387688 is about 45292.2475485596. The cubic root of 2051387688 is about 1270.6206667174.

The spelling of 2051387688 in words is "two billion, fifty-one million, three hundred eighty-seven thousand, six hundred eighty-eight".