78261684 has 24 divisors (see below), whose sum is σ = 192222240. Its totient is φ = 24714144.

The previous prime is 78261647. The next prime is 78261713. The reversal of 78261684 is 48616287.

It is a super-2 number, since 2×78261684² = 12249782365031712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 171399 + ... + 171854.

It is an arithmetic number, because the mean of its divisors is an integer number (8009260).

Almost surely, 2^78261684 is an apocalyptic number.

It is an amenable number.

78261684 is an abundant number, since it is smaller than the sum of its proper divisors (113960556).

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

78261684 is a wasteful number, since it uses less digits than its factorization.

78261684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343279 (or 343277 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 78261684 is about 8846.5634005528. The cubic root of 78261684 is about 427.7431495267.

The spelling of 78261684 in words is "seventy-eight million, two hundred sixty-one thousand, six hundred eighty-four".