9957720 has 32 divisors (see below), whose sum is σ = 29873520. Its totient is φ = 2655360.

The previous prime is 9957697. The next prime is 9957737. The reversal of 9957720 is 277599.

9957720 = T₃₁ + T₃₂ + ... + T₃₉₀.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41371 + ... + 41610.

Almost surely, 2^9957720 is an apocalyptic number.

It is an amenable number.

9957720 is an abundant number, since it is smaller than the sum of its proper divisors (19915800).

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

9957720 is a wasteful number, since it uses less digits than its factorization.

9957720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82995 (or 82991 counting only the distinct ones).

The product of its (nonzero) digits is 39690, while the sum is 39.

The square root of 9957720 is about 3155.5855241143. The cubic root of 9957720 is about 215.1394084147.

The spelling of 9957720 in words is "nine million, nine hundred fifty-seven thousand, seven hundred twenty".