908009993890 has 16 divisors (see below), whose sum is σ = 1635873412608. Its totient is φ = 362880570096.

The previous prime is 908009993881. The next prime is 908009993951. The reversal of 908009993890 is 98399900809.

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, 40416642 + ... + 40439101.

It is an arithmetic number, because the mean of its divisors is an integer number (102242088288).

Almost surely, 2^908009993890 is an apocalyptic number.

908009993890 is a deficient number, since it is larger than the sum of its proper divisors (727863418718).

908009993890 is a wasteful number, since it uses less digits than its factorization.

908009993890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80856873.

The product of its (nonzero) digits is 11337408, while the sum is 64.

The spelling of 908009993890 in words is "nine hundred eight billion, nine million, nine hundred ninety-three thousand, eight hundred ninety".