78147946 has 8 divisors (see below), whose sum is σ = 124117380. Its totient is φ = 36775488.

The previous prime is 78147913. The next prime is 78147947. The reversal of 78147946 is 64974187.

It can be written as a sum of positive squares in 2 ways, for example, as 74632321 + 3515625 = 8639^2 + 1875^2 .

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

It is a super-2 number, since 2×78147946² = 12214202928037832, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78147896 and 78147905.

It is not an unprimeable number, because it can be changed into a prime (78147947) 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, 1149201 + ... + 1149268.

Almost surely, 2^78147946 is an apocalyptic number.

78147946 is a deficient number, since it is larger than the sum of its proper divisors (45969434).

78147946 is a wasteful number, since it uses less digits than its factorization.

78147946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2298488.

The product of its digits is 338688, while the sum is 46.

The square root of 78147946 is about 8840.1326913118. The cubic root of 78147946 is about 427.5358354876.

The spelling of 78147946 in words is "seventy-eight million, one hundred forty-seven thousand, nine hundred forty-six".