7281630 has 64 divisors (see below), whose sum is σ = 19656000. Its totient is φ = 1918080.

The previous prime is 7281629. The next prime is 7281649. The reversal of 7281630 is 361827.

7281630 is a `hidden beast` number, since 7 + 28 + 1 + 630 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 7281594 and 7281603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40140 + ... + 40320.

It is an arithmetic number, because the mean of its divisors is an integer number (307125).

Almost surely, 2^7281630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7281630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9828000).

7281630 is an abundant number, since it is smaller than the sum of its proper divisors (12374370).

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

7281630 is a wasteful number, since it uses less digits than its factorization.

7281630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 7281630 is about 2698.4495548370. The cubic root of 7281630 is about 193.8248853780.

The spelling of 7281630 in words is "seven million, two hundred eighty-one thousand, six hundred thirty".