78493947 has 16 divisors (see below), whose sum is σ = 126646272. Its totient is φ = 42215040.

The previous prime is 78493927. The next prime is 78493951. The reversal of 78493947 is 74939487.

It is a happy number.

It is not a de Polignac number, because 78493947 - 2¹⁴ = 78477563 is a prime.

It is a super-2 number, since 2×78493947² = 12322599431277618, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 78493947.

It is not an unprimeable number, because it can be changed into a prime (78493927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109579 + ... + 110292.

It is an arithmetic number, because the mean of its divisors is an integer number (7915392).

Almost surely, 2^78493947 is an apocalyptic number.

78493947 is a deficient number, since it is larger than the sum of its proper divisors (48152325).

78493947 is a wasteful number, since it uses less digits than its factorization.

78493947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219898.

The product of its digits is 1524096, while the sum is 51.

The square root of 78493947 is about 8859.6809761977. The cubic root of 78493947 is about 428.1658799616.

The spelling of 78493947 in words is "seventy-eight million, four hundred ninety-three thousand, nine hundred forty-seven".