77780956 has 24 divisors (see below), whose sum is σ = 152507376. Its totient is φ = 34398720.

The previous prime is 77780947. The next prime is 77780957. The reversal of 77780956 is 65908777.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77780957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22261 + ... + 25516.

It is an arithmetic number, because the mean of its divisors is an integer number (6354474).

Almost surely, 2^77780956 is an apocalyptic number.

It is an amenable number.

77780956 is a deficient number, since it is larger than the sum of its proper divisors (74726420).

77780956 is a wasteful number, since it uses less digits than its factorization.

77780956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47829 (or 47827 counting only the distinct ones).

The product of its (nonzero) digits is 740880, while the sum is 49.

The square root of 77780956 is about 8819.3512233044. The cubic root of 77780956 is about 426.8655358192.

The spelling of 77780956 in words is "seventy-seven million, seven hundred eighty thousand, nine hundred fifty-six".