9999764 has 6 divisors (see below), whose sum is σ = 17499594. Its totient is φ = 4999880.

The previous prime is 9999761. The next prime is 9999823. The reversal of 9999764 is 4679999.

It can be written as a sum of positive squares in only one way, i.e., 8880400 + 1119364 = 2980^2 + 1058^2 .

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1249967 + ... + 1249974.

It is an arithmetic number, because the mean of its divisors is an integer number (2916599).

Almost surely, 2^9999764 is an apocalyptic number.

It is an amenable number.

9999764 is a deficient number, since it is larger than the sum of its proper divisors (7499830).

9999764 is a wasteful number, since it uses less digits than its factorization.

9999764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2499945 (or 2499943 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 53.

The square root of 9999764 is about 3162.2403450718. The cubic root of 9999764 is about 215.4417741679.

The spelling of 9999764 in words is "nine million, nine hundred ninety-nine thousand, seven hundred sixty-four".