78240785 has 16 divisors (see below), whose sum is σ = 109123200. Its totient is φ = 52740096.

The previous prime is 78240769. The next prime is 78240821. The reversal of 78240785 is 58704287.

It is a cyclic number.

It is not a de Polignac number, because 78240785 - 2⁴ = 78240769 is a prime.

It is a super-2 number, since 2×78240785² = 12243240874832450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16880 + ... + 21009.

It is an arithmetic number, because the mean of its divisors is an integer number (6820200).

Almost surely, 2^78240785 is an apocalyptic number.

It is an amenable number.

78240785 is a deficient number, since it is larger than the sum of its proper divisors (30882415).

78240785 is a wasteful number, since it uses less digits than its factorization.

78240785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37960.

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 78240785 is about 8845.3821285459. The cubic root of 78240785 is about 427.7050712936.

The spelling of 78240785 in words is "seventy-eight million, two hundred forty thousand, seven hundred eighty-five".