77770044 has 60 divisors (see below), whose sum is σ = 221798808. Its totient is φ = 23565600.

The previous prime is 77770013. The next prime is 77770051. The reversal of 77770044 is 44007777.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 77769990 and 77770008.

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 7347 + ... + 14474.

Almost surely, 2^77770044 is an apocalyptic number.

It is an amenable number.

77770044 is an abundant number, since it is smaller than the sum of its proper divisors (144028764).

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

77770044 is a wasteful number, since it uses less digits than its factorization.

77770044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21848 (or 21837 counting only the distinct ones).

The product of its (nonzero) digits is 38416, while the sum is 36.

The square root of 77770044 is about 8818.7325619955. The cubic root of 77770044 is about 426.8455730297.

The spelling of 77770044 in words is "seventy-seven million, seven hundred seventy thousand, forty-four".