77731772 has 6 divisors (see below), whose sum is σ = 136030608. Its totient is φ = 38865884.

The previous prime is 77731739. The next prime is 77731781. The reversal of 77731772 is 27713777.

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 as a sum of consecutive naturals, namely, 9716468 + ... + 9716475.

It is an arithmetic number, because the mean of its divisors is an integer number (22671768).

Almost surely, 2^77731772 is an apocalyptic number.

It is an amenable number.

77731772 is a deficient number, since it is larger than the sum of its proper divisors (58298836).

77731772 is a wasteful number, since it uses less digits than its factorization.

77731772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19432947 (or 19432945 counting only the distinct ones).

The product of its digits is 100842, while the sum is 41.

The square root of 77731772 is about 8816.5623686333. The cubic root of 77731772 is about 426.7755421479.

The spelling of 77731772 in words is "seventy-seven million, seven hundred thirty-one thousand, seven hundred seventy-two".