8151620 has 24 divisors (see below), whose sum is σ = 17537688. Its totient is φ = 3180800.

The previous prime is 8151607. The next prime is 8151623. The reversal of 8151620 is 261518.

It can be written as a sum of positive squares in 4 ways, for example, as 937024 + 7214596 = 968^2 + 2686^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (8151623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4151 + ... + 5790.

It is an arithmetic number, because the mean of its divisors is an integer number (730737).

Almost surely, 2^8151620 is an apocalyptic number.

It is an amenable number.

8151620 is an abundant number, since it is smaller than the sum of its proper divisors (9386068).

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

8151620 is a wasteful number, since it uses less digits than its factorization.

8151620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9991 (or 9989 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 8151620 is about 2855.1042012508. The cubic root of 8151620 is about 201.2556008369.

The spelling of 8151620 in words is "eight million, one hundred fifty-one thousand, six hundred twenty".