77722472 has 8 divisors (see below), whose sum is σ = 145729650. Its totient is φ = 38861232.

The previous prime is 77722471. The next prime is 77722517. The reversal of 77722472 is 27422777.

It can be written as a sum of positive squares in only one way, i.e., 64224196 + 13498276 = 8014^2 + 3674^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (77722471) by changing a digit.

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, 4857647 + ... + 4857662.

Almost surely, 2^77722472 is an apocalyptic number.

It is an amenable number.

77722472 is a deficient number, since it is larger than the sum of its proper divisors (68007178).

77722472 is a wasteful number, since it uses less digits than its factorization.

77722472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9715315 (or 9715311 counting only the distinct ones).

The product of its digits is 76832, while the sum is 38.

The square root of 77722472 is about 8816.0349364099. The cubic root of 77722472 is about 426.7585213478.

The spelling of 77722472 in words is "seventy-seven million, seven hundred twenty-two thousand, four hundred seventy-two".