77989940 has 48 divisors (see below), whose sum is σ = 189138432. Its totient is φ = 26459136.

The previous prime is 77989939. The next prime is 77989963. The reversal of 77989940 is 4998977.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10709 + ... + 16451.

It is an arithmetic number, because the mean of its divisors is an integer number (3940384).

Almost surely, 2^77989940 is an apocalyptic number.

77989940 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77989940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94569216).

77989940 is an abundant number, since it is smaller than the sum of its proper divisors (111148492).

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

77989940 is a wasteful number, since it uses less digits than its factorization.

77989940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5856 (or 5854 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 53.

The square root of 77989940 is about 8831.1913126146. The cubic root of 77989940 is about 427.2474985995.

The spelling of 77989940 in words is "seventy-seven million, nine hundred eighty-nine thousand, nine hundred forty".