78363840 has 56 divisors (see below), whose sum is σ = 248808240. Its totient is φ = 20896768.

The previous prime is 78363827. The next prime is 78363841. The reversal of 78363840 is 4836387.

It is a super-2 number, since 2×78363840² = 12281782839091200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78363841) 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 7 ways as a sum of consecutive naturals, for example, 39855 + ... + 41774.

Almost surely, 2^78363840 is an apocalyptic number.

It is an amenable number.

78363840 is an abundant number, since it is smaller than the sum of its proper divisors (170444400).

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

78363840 is a wasteful number, since it uses less digits than its factorization.

78363840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81649 (or 81639 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 78363840 is about 8852.3352851098. The cubic root of 78363840 is about 427.9291815165.

The spelling of 78363840 in words is "seventy-eight million, three hundred sixty-three thousand, eight hundred forty".