648858890 has 32 divisors (see below), whose sum is σ = 1243615680. Its totient is φ = 242900224.

The previous prime is 648858871. The next prime is 648858901. The reversal of 648858890 is 98858846.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19769 + ... + 41091.

It is an arithmetic number, because the mean of its divisors is an integer number (38862990).

Almost surely, 2^648858890 is an apocalyptic number.

648858890 is a deficient number, since it is larger than the sum of its proper divisors (594756790).

648858890 is a wasteful number, since it uses less digits than its factorization.

648858890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21526.

The product of its (nonzero) digits is 4423680, while the sum is 56.

The square root of 648858890 is about 25472.7087291478. The cubic root of 648858890 is about 865.7318986177.

The spelling of 648858890 in words is "six hundred forty-eight million, eight hundred fifty-eight thousand, eight hundred ninety".