99991772 has 6 divisors (see below), whose sum is σ = 174985608. Its totient is φ = 49995884.

The previous prime is 99991769. The next prime is 99991789. The reversal of 99991772 is 27719999.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12498968 + ... + 12498975.

It is an arithmetic number, because the mean of its divisors is an integer number (29164268).

Almost surely, 2^99991772 is an apocalyptic number.

It is an amenable number.

99991772 is a deficient number, since it is larger than the sum of its proper divisors (74993836).

99991772 is a wasteful number, since it uses less digits than its factorization.

99991772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24997947 (or 24997945 counting only the distinct ones).

The product of its digits is 642978, while the sum is 53.

The square root of 99991772 is about 9999.5885915372. The cubic root of 99991772 is about 464.1461526811.

The spelling of 99991772 in words is "ninety-nine million, nine hundred ninety-one thousand, seven hundred seventy-two".