787666785 has 16 divisors (see below), whose sum is σ = 1291006080. Its totient is φ = 409842560.

The previous prime is 787666783. The next prime is 787666799. The reversal of 787666785 is 587666787.

It is not a de Polignac number, because 787666785 - 2¹ = 787666783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (787666783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 639765 + ... + 640994.

It is an arithmetic number, because the mean of its divisors is an integer number (80687880).

Almost surely, 2^787666785 is an apocalyptic number.

It is an amenable number.

787666785 is a deficient number, since it is larger than the sum of its proper divisors (503339295).

787666785 is a wasteful number, since it uses less digits than its factorization.

787666785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280808.

The product of its digits is 23708160, while the sum is 60.

The square root of 787666785 is about 28065.4019212268. The cubic root of 787666785 is about 923.5225637811.

The spelling of 787666785 in words is "seven hundred eighty-seven million, six hundred sixty-six thousand, seven hundred eighty-five".