78340746 has 16 divisors (see below), whose sum is σ = 170925408. Its totient is φ = 23739600.

The previous prime is 78340739. The next prime is 78340747. The reversal of 78340746 is 64704387.

It is a happy number.

It is a super-2 number, since 2×78340746² = 12274544967673032, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78340747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 593425 + ... + 593556.

It is an arithmetic number, because the mean of its divisors is an integer number (10682838).

Almost surely, 2^78340746 is an apocalyptic number.

78340746 is an abundant number, since it is smaller than the sum of its proper divisors (92584662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78340746 is a wasteful number, since it uses less digits than its factorization.

78340746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186997.

The product of its (nonzero) digits is 112896, while the sum is 39.

The square root of 78340746 is about 8851.0307874281. The cubic root of 78340746 is about 427.8871401554.

The spelling of 78340746 in words is "seventy-eight million, three hundred forty thousand, seven hundred forty-six".