78376644 has 36 divisors (see below), whose sum is σ = 199980144. Its totient is φ = 25880112.

The previous prime is 78376637. The next prime is 78376673. The reversal of 78376644 is 44667387.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×78376644² = 12285796649405472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78376644.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6322 + ... + 14025.

It is an arithmetic number, because the mean of its divisors is an integer number (5555004).

Almost surely, 2^78376644 is an apocalyptic number.

It is an amenable number.

78376644 is an abundant number, since it is smaller than the sum of its proper divisors (121603500).

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

78376644 is a wasteful number, since it uses less digits than its factorization.

78376644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20464 (or 20459 counting only the distinct ones).

The product of its digits is 677376, while the sum is 45.

The square root of 78376644 is about 8853.0584545681. The cubic root of 78376644 is about 427.9524869375.

The spelling of 78376644 in words is "seventy-eight million, three hundred seventy-six thousand, six hundred forty-four".