78289746 has 64 divisors (see below), whose sum is σ = 170263296. Its totient is φ = 23936000.

The previous prime is 78289741. The next prime is 78289759. The reversal of 78289746 is 64798287.

It is a super-2 number, since 2×78289746² = 12258568657489032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78289741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 571390 + ... + 571526.

It is an arithmetic number, because the mean of its divisors is an integer number (2660364).

Almost surely, 2^78289746 is an apocalyptic number.

78289746 is an abundant number, since it is smaller than the sum of its proper divisors (91973550).

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

78289746 is a wasteful number, since it uses less digits than its factorization.

78289746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307.

The product of its digits is 1354752, while the sum is 51.

The square root of 78289746 is about 8848.1492980171. The cubic root of 78289746 is about 427.7942681724.

The spelling of 78289746 in words is "seventy-eight million, two hundred eighty-nine thousand, seven hundred forty-six".