78406333982 has 4 divisors (see below), whose sum is σ = 117609500976. Its totient is φ = 39203166990.

The previous prime is 78406333963. The next prime is 78406333987. The reversal of 78406333982 is 28933360487.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×78406333982² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78406333987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19601583494 + ... + 19601583497.

It is an arithmetic number, because the mean of its divisors is an integer number (29402375244).

Almost surely, 2^78406333982 is an apocalyptic number.

78406333982 is a deficient number, since it is larger than the sum of its proper divisors (39203166994).

78406333982 is a wasteful number, since it uses less digits than its factorization.

78406333982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39203166993.

The product of its (nonzero) digits is 5225472, while the sum is 53.

The spelling of 78406333982 in words is "seventy-eight billion, four hundred six million, three hundred thirty-three thousand, nine hundred eighty-two".