78981946 has 12 divisors (see below), whose sum is σ = 120458286. Its totient is φ = 38839920.

The previous prime is 78981941. The next prime is 78981967. The reversal of 78981946 is 64918987.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 52056225 + 26925721 = 7215^2 + 5189^2 .

It is a super-3 number, since 3×78981946³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78981893 and 78981902.

It is not an unprimeable number, because it can be changed into a prime (78981941) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2136 + ... + 12748.

Almost surely, 2^78981946 is an apocalyptic number.

78981946 is a deficient number, since it is larger than the sum of its proper divisors (41476340).

78981946 is a wasteful number, since it uses less digits than its factorization.

78981946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10737 (or 10676 counting only the distinct ones).

The product of its digits is 870912, while the sum is 52.

The square root of 78981946 is about 8887.1787424356. The cubic root of 78981946 is about 429.0513537849.

The spelling of 78981946 in words is "seventy-eight million, nine hundred eighty-one thousand, nine hundred forty-six".