77990224 has 20 divisors (see below), whose sum is σ = 162730036. Its totient is φ = 35995392.

The previous prime is 77990219. The next prime is 77990233. The reversal of 77990224 is 42209977.

It can be written as a sum of positive squares in 2 ways, for example, as 4579600 + 73410624 = 2140^2 + 8568^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187269 + ... + 187684.

Almost surely, 2^77990224 is an apocalyptic number.

It is an amenable number.

77990224 is an abundant number, since it is smaller than the sum of its proper divisors (84739812).

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

77990224 is a wasteful number, since it uses less digits than its factorization.

77990224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374974 (or 374968 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 77990224 is about 8831.2073919708. The cubic root of 77990224 is about 427.2480172055.

The spelling of 77990224 in words is "seventy-seven million, nine hundred ninety thousand, two hundred twenty-four".