7971620 has 12 divisors (see below), whose sum is σ = 16740444. Its totient is φ = 3188640.

The previous prime is 7971617. The next prime is 7971643. The reversal of 7971620 is 261797.

It can be written as a sum of positive squares in 2 ways, for example, as 5943844 + 2027776 = 2438^2 + 1424^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199271 + ... + 199310.

It is an arithmetic number, because the mean of its divisors is an integer number (1395037).

Almost surely, 2^7971620 is an apocalyptic number.

It is an amenable number.

7971620 is an abundant number, since it is smaller than the sum of its proper divisors (8768824).

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

7971620 is a wasteful number, since it uses less digits than its factorization.

7971620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398590 (or 398588 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 7971620 is about 2823.4057448408. The cubic root of 7971620 is about 199.7632197863.

The spelling of 7971620 in words is "seven million, nine hundred seventy-one thousand, six hundred twenty".