78376640 has 84 divisors (see below), whose sum is σ = 195523104. Its totient is φ = 29922816.

The previous prime is 78376637. The next prime is 78376673. The reversal of 78376640 is 4667387.

It is a super-2 number, since 2×78376640² = 12285795395379200, which contains 22 as substring.

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, 169049 + ... + 169511.

It is an arithmetic number, because the mean of its divisors is an integer number (2327656).

Almost surely, 2^78376640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78376640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97761552).

78376640 is an abundant number, since it is smaller than the sum of its proper divisors (117146464).

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

78376640 is a wasteful number, since it uses less digits than its factorization.

78376640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 493 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 41.

The square root of 78376640 is about 8853.0582286575. The cubic root of 78376640 is about 427.9524796572.

The spelling of 78376640 in words is "seventy-eight million, three hundred seventy-six thousand, six hundred forty".