77245556 has 6 divisors (see below), whose sum is σ = 135179730. Its totient is φ = 38622776.

The previous prime is 77245549. The next prime is 77245559. The reversal of 77245556 is 65554277.

It can be written as a sum of positive squares in only one way, i.e., 75968656 + 1276900 = 8716^2 + 1130^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77245559) 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, 9655691 + ... + 9655698.

It is an arithmetic number, because the mean of its divisors is an integer number (22529955).

Almost surely, 2^77245556 is an apocalyptic number.

It is an amenable number.

77245556 is a deficient number, since it is larger than the sum of its proper divisors (57934174).

77245556 is a wasteful number, since it uses less digits than its factorization.

77245556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19311393 (or 19311391 counting only the distinct ones).

The product of its digits is 294000, while the sum is 41.

The square root of 77245556 is about 8788.9451016604. The cubic root of 77245556 is about 425.8838464576.

The spelling of 77245556 in words is "seventy-seven million, two hundred forty-five thousand, five hundred fifty-six".