77990424 has 64 divisors (see below), whose sum is σ = 215447040. Its totient is φ = 23400960.

The previous prime is 77990417. The next prime is 77990461. The reversal of 77990424 is 42409977.

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, 5229 + ... + 13539.

It is an arithmetic number, because the mean of its divisors is an integer number (3366360).

Almost surely, 2^77990424 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 77990424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107723520).

77990424 is an abundant number, since it is smaller than the sum of its proper divisors (137456616).

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

77990424 is a wasteful number, since it uses less digits than its factorization.

77990424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8360 (or 8356 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 77990424 is about 8831.2187154435. The cubic root of 77990424 is about 427.2483824202.

The spelling of 77990424 in words is "seventy-seven million, nine hundred ninety thousand, four hundred twenty-four".