78879946 has 8 divisors (see below), whose sum is σ = 118760580. Its totient is φ = 39293088.

The previous prime is 78879943. The next prime is 78879961. The reversal of 78879946 is 64997887.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 74149321 + 4730625 = 8611^2 + 2175^2 .

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

It is not an unprimeable number, because it can be changed into a prime (78879943) 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, 72771 + ... + 73846.

Almost surely, 2^78879946 is an apocalyptic number.

78879946 is a deficient number, since it is larger than the sum of its proper divisors (39880634).

78879946 is a wasteful number, since it uses less digits than its factorization.

78879946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146888.

The product of its digits is 6096384, while the sum is 58.

The square root of 78879946 is about 8881.4382844222. The cubic root of 78879946 is about 428.8665769975.

The spelling of 78879946 in words is "seventy-eight million, eight hundred seventy-nine thousand, nine hundred forty-six".