863551840 has 48 divisors (see below), whose sum is σ = 2089916640. Its totient is φ = 336993280.

The previous prime is 863551831. The next prime is 863551849. The reversal of 863551840 is 48155368.

It is an interprime number because it is at equal distance from previous prime (863551831) and next prime (863551849).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 863551793 and 863551802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863551849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59260 + ... + 72379.

It is an arithmetic number, because the mean of its divisors is an integer number (43539930).

Almost surely, 2^863551840 is an apocalyptic number.

863551840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

863551840 is an abundant number, since it is smaller than the sum of its proper divisors (1226364800).

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

863551840 is a wasteful number, since it uses less digits than its factorization.

863551840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131695 (or 131687 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 863551840 is about 29386.2525681653. The cubic root of 863551840 is about 952.2759245387.

The spelling of 863551840 in words is "eight hundred sixty-three million, five hundred fifty-one thousand, eight hundred forty".