78477946 has 8 divisors (see below), whose sum is σ = 117754560. Its totient is φ = 39226428.

The previous prime is 78477941. The next prime is 78477953. The reversal of 78477946 is 64977487.

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

It is a junction number, because it is equal to n+sod(n) for n = 78477893 and 78477902.

It is not an unprimeable number, because it can be changed into a prime (78477941) 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, 8575 + ... + 15181.

It is an arithmetic number, because the mean of its divisors is an integer number (14719320).

Almost surely, 2^78477946 is an apocalyptic number.

78477946 is a deficient number, since it is larger than the sum of its proper divisors (39276614).

78477946 is a wasteful number, since it uses less digits than its factorization.

78477946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12548.

The product of its digits is 2370816, while the sum is 52.

The square root of 78477946 is about 8858.7779066867. Note that the first 3 decimals coincide. The cubic root of 78477946 is about 428.1367840968.

The spelling of 78477946 in words is "seventy-eight million, four hundred seventy-seven thousand, nine hundred forty-six".