78240706 has 4 divisors (see below), whose sum is σ = 117361062. Its totient is φ = 39120352.

The previous prime is 78240703. The next prime is 78240709. The reversal of 78240706 is 60704287.

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

It is an interprime number because it is at equal distance from previous prime (78240703) and next prime (78240709).

It can be written as a sum of positive squares in only one way, i.e., 56385081 + 21855625 = 7509^2 + 4675^2 .

It is a super-2 number, since 2×78240706² = 12243216150756872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78240703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19560175 + ... + 19560178.

Almost surely, 2^78240706 is an apocalyptic number.

78240706 is a deficient number, since it is larger than the sum of its proper divisors (39120356).

78240706 is a wasteful number, since it uses less digits than its factorization.

78240706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39120355.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 78240706 is about 8845.3776629379. The cubic root of 78240706 is about 427.7049273418.

The spelling of 78240706 in words is "seventy-eight million, two hundred forty thousand, seven hundred six".