8631978 has 8 divisors (see below), whose sum is σ = 17263968. Its totient is φ = 2877324.

The previous prime is 8631977. The next prime is 8631979. The reversal of 8631978 is 8791368.

8631978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (8631977) and next prime (8631979).

It is a sphenic number, since it is the product of 3 distinct primes.

8631978 is an admirable number.

It is a super-2 number, since 2×8631978² = 149022088384968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8631977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 719326 + ... + 719337.

It is an arithmetic number, because the mean of its divisors is an integer number (2157996).

Almost surely, 2^8631978 is an apocalyptic number.

8631978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

8631978 is a wasteful number, since it uses less digits than its factorization.

8631978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1438668.

The product of its digits is 72576, while the sum is 42.

The square root of 8631978 is about 2938.0228045405. The cubic root of 8631978 is about 205.1335873297.

The spelling of 8631978 in words is "eight million, six hundred thirty-one thousand, nine hundred seventy-eight".