78243038 has 4 divisors (see below), whose sum is σ = 117364560. Its totient is φ = 39121518.

The previous prime is 78243037. The next prime is 78243043. The reversal of 78243038 is 83034287.

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

It is a super-2 number, since 2×78243038² = 12243945990938888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78242989 and 78243007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78243037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19560758 + ... + 19560761.

It is an arithmetic number, because the mean of its divisors is an integer number (29341140).

Almost surely, 2^78243038 is an apocalyptic number.

78243038 is a deficient number, since it is larger than the sum of its proper divisors (39121522).

78243038 is a wasteful number, since it uses less digits than its factorization.

78243038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39121521.

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 78243038 is about 8845.5094822175. The cubic root of 78243038 is about 427.7091766132.

The spelling of 78243038 in words is "seventy-eight million, two hundred forty-three thousand, thirty-eight".