78240705 has 16 divisors (see below), whose sum is σ = 125448000. Its totient is φ = 41640768.

The previous prime is 78240703. The next prime is 78240709. The reversal of 78240705 is 50704287.

It is not a de Polignac number, because 78240705 - 2¹ = 78240703 is a prime.

It is a super-2 number, since 2×78240705² = 12243215837794050, 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 in 15 ways as a sum of consecutive naturals, for example, 2259 + ... + 12711.

It is an arithmetic number, because the mean of its divisors is an integer number (7840500).

Almost surely, 2^78240705 is an apocalyptic number.

It is an amenable number.

78240705 is a deficient number, since it is larger than the sum of its proper divisors (47207295).

78240705 is a wasteful number, since it uses less digits than its factorization.

78240705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10960.

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 78240705 is about 8845.3776064112. The cubic root of 78240705 is about 427.7049255196.

The spelling of 78240705 in words is "seventy-eight million, two hundred forty thousand, seven hundred five".