820361607987 has 32 divisors (see below), whose sum is σ = 1187899582464. Its totient is φ = 502400966400.

The previous prime is 820361607983. The next prime is 820361608057. The reversal of 820361607987 is 789706163028.

It is not a de Polignac number, because 820361607987 - 2² = 820361607983 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (820361607983) 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, 2766333 + ... + 3048494.

It is an arithmetic number, because the mean of its divisors is an integer number (37121861952).

Almost surely, 2^820361607987 is an apocalyptic number.

820361607987 is a deficient number, since it is larger than the sum of its proper divisors (367537974477).

820361607987 is a wasteful number, since it uses less digits than its factorization.

820361607987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5814939.

The product of its (nonzero) digits is 6096384, while the sum is 57.

The spelling of 820361607987 in words is "eight hundred twenty billion, three hundred sixty-one million, six hundred seven thousand, nine hundred eighty-seven".