648927720 has 128 divisors (see below), whose sum is σ = 2472134400. Its totient is φ = 148324608.

The previous prime is 648927703. The next prime is 648927737. The reversal of 648927720 is 27729846.

It is an interprime number because it is at equal distance from previous prime (648927703) and next prime (648927737).

It is a super-2 number, since 2×648927720² = 842214371568796800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35359 + ... + 50478.

It is an arithmetic number, because the mean of its divisors is an integer number (19313550).

Almost surely, 2^648927720 is an apocalyptic number.

648927720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

648927720 is an abundant number, since it is smaller than the sum of its proper divisors (1823206680).

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

648927720 is a wasteful number, since it uses less digits than its factorization.

648927720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85864 (or 85854 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 648927720 is about 25474.0597471232. The cubic root of 648927720 is about 865.7625093924.

The spelling of 648927720 in words is "six hundred forty-eight million, nine hundred twenty-seven thousand, seven hundred twenty".