648876690 has 384 divisors, whose sum is σ = 2293401600. Its totient is φ = 126783360.

The previous prime is 648876671. The next prime is 648876737. The reversal of 648876690 is 96678846.

648876690 is a `hidden beast` number, since 6 + 488 + 76 + 6 + 90 = 666.

It is a super-2 number, since 2×648876690² = 842081917650712200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 10997881 + ... + 10997939.

It is an arithmetic number, because the mean of its divisors is an integer number (5972400).

Almost surely, 2^648876690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 648876690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1146700800).

648876690 is an abundant number, since it is smaller than the sum of its proper divisors (1644524910).

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

648876690 is a wasteful number, since it uses less digits than its factorization.

648876690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The square root of 648876690 is about 25473.0581202964. The cubic root of 648876690 is about 865.7398150215.

The spelling of 648876690 in words is "six hundred forty-eight million, eight hundred seventy-six thousand, six hundred ninety".