648740 has 24 divisors (see below), whose sum is σ = 1377600. Its totient is φ = 256608.

The previous prime is 648731. The next prime is 648763. The reversal of 648740 is 47846.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 648740.

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, 3161 + ... + 3359.

It is an arithmetic number, because the mean of its divisors is an integer number (57400).

2⁶⁴⁸⁷⁴⁰ is an apocalyptic number.

It is an amenable number.

648740 is an abundant number, since it is smaller than the sum of its proper divisors (728860).

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

648740 is a wasteful number, since it uses less digits than its factorization.

648740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371 (or 369 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 648740 is about 805.4439769469. The cubic root of 648740 is about 86.5679019554.

The spelling of 648740 in words is "six hundred forty-eight thousand, seven hundred forty".