766728990 has 40 divisors (see below), whose sum is σ = 2061651240. Its totient is φ = 204460848.

The previous prime is 766728979. The next prime is 766728997. The reversal of 766728990 is 99827667.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766728997) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 472480 + ... + 474099.

It is an arithmetic number, because the mean of its divisors is an integer number (51541281).

Almost surely, 2^766728990 is an apocalyptic number.

766728990 is an abundant number, since it is smaller than the sum of its proper divisors (1294922250).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

766728990 is a wasteful number, since it uses less digits than its factorization.

766728990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946598 (or 946589 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The square root of 766728990 is about 27689.8716140036. The cubic root of 766728990 is about 915.2659264687.

The spelling of 766728990 in words is "seven hundred sixty-six million, seven hundred twenty-eight thousand, nine hundred ninety".