78291984434 has 8 divisors (see below), whose sum is σ = 117838789740. Its totient is φ = 39012387856.

The previous prime is 78291984431. The next prime is 78291984451. The reversal of 78291984434 is 43448919287.

It can be written as a sum of positive squares in 2 ways, for example, as 64732080625 + 13559903809 = 254425^2 + 116447^2 .

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

It is a super-2 number, since 2×78291984434² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78291984431) 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, 66801449 + ... + 66802620.

Almost surely, 2^78291984434 is an apocalyptic number.

78291984434 is a deficient number, since it is larger than the sum of its proper divisors (39546805306).

78291984434 is a wasteful number, since it uses less digits than its factorization.

78291984434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133604364.

The product of its digits is 13934592, while the sum is 59.

The spelling of 78291984434 in words is "seventy-eight billion, two hundred ninety-one million, nine hundred eighty-four thousand, four hundred thirty-four".