648757998 has 48 divisors (see below), whose sum is σ = 1665955200. Its totient is φ = 185358456.

The previous prime is 648757969. The next prime is 648758017. The reversal of 648757998 is 899757846.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91948 + ... + 98751.

It is an arithmetic number, because the mean of its divisors is an integer number (34707400).

Almost surely, 2^648757998 is an apocalyptic number.

648757998 is an abundant number, since it is smaller than the sum of its proper divisors (1017197202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

648757998 is a wasteful number, since it uses less digits than its factorization.

648757998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190723 (or 190711 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 63.

The square root of 648757998 is about 25470.7282581398. The cubic root of 648757998 is about 865.6870249934.

The spelling of 648757998 in words is "six hundred forty-eight million, seven hundred fifty-seven thousand, nine hundred ninety-eight".