688948090 has 16 divisors (see below), whose sum is σ = 1266492672. Its totient is φ = 269715664.

The previous prime is 688948087. The next prime is 688948109. The reversal of 688948090 is 90849886.

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, 732454 + ... + 733393.

It is an arithmetic number, because the mean of its divisors is an integer number (79155792).

Almost surely, 2^688948090 is an apocalyptic number.

688948090 is a deficient number, since it is larger than the sum of its proper divisors (577544582).

688948090 is a wasteful number, since it uses less digits than its factorization.

688948090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465901.

The product of its (nonzero) digits is 995328, while the sum is 52.

The square root of 688948090 is about 26247.8206714386. The cubic root of 688948090 is about 883.2063174042.

The spelling of 688948090 in words is "six hundred eighty-eight million, nine hundred forty-eight thousand, ninety".