787772666 has 16 divisors (see below), whose sum is σ = 1202387328. Its totient is φ = 386991600.

The previous prime is 787772663. The next prime is 787772669. The reversal of 787772666 is 666277787.

It is an interprime number because it is at equal distance from previous prime (787772663) and next prime (787772669).

It is not an unprimeable number, because it can be changed into a prime (787772663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122651 + ... + 128913.

It is an arithmetic number, because the mean of its divisors is an integer number (75149208).

Almost surely, 2^787772666 is an apocalyptic number.

787772666 is a deficient number, since it is larger than the sum of its proper divisors (414614662).

787772666 is a wasteful number, since it uses less digits than its factorization.

787772666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7357.

The product of its digits is 8297856, while the sum is 56.

The square root of 787772666 is about 28067.2881839340. The cubic root of 787772666 is about 923.5639430011.

The spelling of 787772666 in words is "seven hundred eighty-seven million, seven hundred seventy-two thousand, six hundred sixty-six".