1681287798 has 16 divisors (see below), whose sum is σ = 3388245696. Its totient is φ = 556150920.

The previous prime is 1681287793. The next prime is 1681287809. The reversal of 1681287798 is 8977821861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681287791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1068736 + ... + 1070307.

It is an arithmetic number, because the mean of its divisors is an integer number (211765356).

Almost surely, 2^1681287798 is an apocalyptic number.

1681287798 is an abundant number, since it is smaller than the sum of its proper divisors (1706957898).

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

1681287798 is a wasteful number, since it uses less digits than its factorization.

1681287798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2139179.

The product of its digits is 2709504, while the sum is 57.

The square root of 1681287798 is about 41003.5095814980. The cubic root of 1681287798 is about 1189.0880657818.

The spelling of 1681287798 in words is "one billion, six hundred eighty-one million, two hundred eighty-seven thousand, seven hundred ninety-eight".