878247981 has 32 divisors (see below), whose sum is σ = 1424976000. Its totient is φ = 531287424.

The previous prime is 878247961. The next prime is 878248013. The reversal of 878247981 is 189742878.

It is a happy number.

It is not a de Polignac number, because 878247981 - 2⁶ = 878247917 is a prime.

It is a super-2 number, since 2×878247981² = 1542639032261152722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878247961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 496 + ... + 41913.

It is an arithmetic number, because the mean of its divisors is an integer number (44530500).

Almost surely, 2^878247981 is an apocalyptic number.

It is an amenable number.

878247981 is a deficient number, since it is larger than the sum of its proper divisors (546728019).

878247981 is a wasteful number, since it uses less digits than its factorization.

878247981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42490 (or 42484 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 54.

The square root of 878247981 is about 29635.2489613298. The cubic root of 878247981 is about 957.6475899082.

The spelling of 878247981 in words is "eight hundred seventy-eight million, two hundred forty-seven thousand, nine hundred eighty-one".