8420756 has 12 divisors (see below), whose sum is σ = 15134868. Its totient is φ = 4096512.

The previous prime is 8420749. The next prime is 8420771. The reversal of 8420756 is 6570248.

It can be written as a sum of positive squares in 2 ways, for example, as 3204100 + 5216656 = 1790^2 + 2284^2 .

It is a super-2 number, since 2×8420756² = 141818263223072, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 28301 + ... + 28596.

It is an arithmetic number, because the mean of its divisors is an integer number (1261239).

Almost surely, 2^8420756 is an apocalyptic number.

It is an amenable number.

8420756 is a deficient number, since it is larger than the sum of its proper divisors (6714112).

8420756 is a wasteful number, since it uses less digits than its factorization.

8420756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56938 (or 56936 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 8420756 is about 2901.8538901881. The cubic root of 8420756 is about 203.4465647804.

The spelling of 8420756 in words is "eight million, four hundred twenty thousand, seven hundred fifty-six".