53991630 has 256 divisors, whose sum is σ = 186624000. Its totient is φ = 11007360.

The previous prime is 53991599. The next prime is 53991647. The reversal of 53991630 is 3619935.

53991630 is a `hidden beast` number, since 539 + 91 + 6 + 30 = 666.

It is a super-2 number, since 2×53991630² = 5830192220113800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1018684 + ... + 1018736.

It is an arithmetic number, because the mean of its divisors is an integer number (729000).

Almost surely, 2^53991630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53991630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93312000).

53991630 is an abundant number, since it is smaller than the sum of its proper divisors (132632370).

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

53991630 is a wasteful number, since it uses less digits than its factorization.

53991630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 36.

The square root of 53991630 is about 7347.8996999143. The cubic root of 53991630 is about 377.9567851831.

The spelling of 53991630 in words is "fifty-three million, nine hundred ninety-one thousand, six hundred thirty".