78369940 has 48 divisors (see below), whose sum is σ = 181367424. Its totient is φ = 28208000.

The previous prime is 78369931. The next prime is 78369943. The reversal of 78369940 is 4996387.

It is a super-2 number, since 2×78369940² = 12283694991207200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78369943) 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 15 ways as a sum of consecutive naturals, for example, 20457 + ... + 23983.

It is an arithmetic number, because the mean of its divisors is an integer number (3778488).

Almost surely, 2^78369940 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 78369940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90683712).

78369940 is an abundant number, since it is smaller than the sum of its proper divisors (102997484).

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

78369940 is a wasteful number, since it uses less digits than its factorization.

78369940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3648 (or 3646 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 78369940 is about 8852.6798202578. The cubic root of 78369940 is about 427.9402848531.

The spelling of 78369940 in words is "seventy-eight million, three hundred sixty-nine thousand, nine hundred forty".