9957816 has 120 divisors (see below), whose sum is σ = 30898560. Its totient is φ = 2993760.

The previous prime is 9957769. The next prime is 9957863. The reversal of 9957816 is 6187599.

9957816 = 46³ + 47³ + ... + 81³.

It is an interprime number because it is at equal distance from previous prime (9957769) and next prime (9957863).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 78345 + ... + 78471.

It is an arithmetic number, because the mean of its divisors is an integer number (257488).

Almost surely, 2^9957816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9957816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15449280).

9957816 is an abundant number, since it is smaller than the sum of its proper divisors (20940744).

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

9957816 is a wasteful number, since it uses less digits than its factorization.

9957816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 143 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 9957816 is about 3155.6007352008. The cubic root of 9957816 is about 215.1400997817.

The spelling of 9957816 in words is "nine million, nine hundred fifty-seven thousand, eight hundred sixteen".