78243782 has 4 divisors (see below), whose sum is σ = 117365676. Its totient is φ = 39121890.

The previous prime is 78243757. The next prime is 78243839. The reversal of 78243782 is 28734287.

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

It is a super-2 number, since 2×78243782² = 12244178843327048, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19560944 + ... + 19560947.

It is an arithmetic number, because the mean of its divisors is an integer number (29341419).

Almost surely, 2^78243782 is an apocalyptic number.

78243782 is a deficient number, since it is larger than the sum of its proper divisors (39121894).

78243782 is a wasteful number, since it uses less digits than its factorization.

78243782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39121893.

The product of its digits is 150528, while the sum is 41.

The square root of 78243782 is about 8845.5515373548. The cubic root of 78243782 is about 427.7105322806.

The spelling of 78243782 in words is "seventy-eight million, two hundred forty-three thousand, seven hundred eighty-two".