981613766 has 36 divisors (see below), whose sum is σ = 1738154124. Its totient is φ = 414557640.

The previous prime is 981613723. The next prime is 981613781. The reversal of 981613766 is 667316189.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 981613766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 493025 + ... + 495011.

It is an arithmetic number, because the mean of its divisors is an integer number (48282059).

Almost surely, 2^981613766 is an apocalyptic number.

981613766 is a deficient number, since it is larger than the sum of its proper divisors (756540358).

981613766 is a wasteful number, since it uses less digits than its factorization.

981613766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145 (or 2067 counting only the distinct ones).

The product of its digits is 326592, while the sum is 47.

The square root of 981613766 is about 31330.7160147993. The cubic root of 981613766 is about 993.8333053801.

The spelling of 981613766 in words is "nine hundred eighty-one million, six hundred thirteen thousand, seven hundred sixty-six".