8215457642 has 16 divisors (see below), whose sum is σ = 14085617472. Its totient is φ = 3520416480.

The previous prime is 8215457629. The next prime is 8215457651. The reversal of 8215457642 is 2467545128.

It is a junction number, because it is equal to n+sod(n) for n = 8215457593 and 8215457602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73142 + ... + 147582.

It is an arithmetic number, because the mean of its divisors is an integer number (880351092).

Almost surely, 2^8215457642 is an apocalyptic number.

8215457642 is a deficient number, since it is larger than the sum of its proper divisors (5870159830).

8215457642 is a wasteful number, since it uses less digits than its factorization.

8215457642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82333.

The product of its digits is 537600, while the sum is 44.

The square root of 8215457642 is about 90639.1617459032. The cubic root of 8215457642 is about 2017.7959852923.

The spelling of 8215457642 in words is "eight billion, two hundred fifteen million, four hundred fifty-seven thousand, six hundred forty-two".