648940 has 24 divisors (see below), whose sum is σ = 1384992. Its totient is φ = 255360.

The previous prime is 648937. The next prime is 648953. The reversal of 648940 is 49846.

It is a super-2 number, since 2×648940² = 842246247200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

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, 1192 + ... + 1648.

It is an arithmetic number, because the mean of its divisors is an integer number (57708).

2⁶⁴⁸⁹⁴⁰ is an apocalyptic number.

It is an amenable number.

648940 is an abundant number, since it is smaller than the sum of its proper divisors (736052).

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

648940 is a wasteful number, since it uses less digits than its factorization.

648940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537 (or 535 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 648940 is about 805.5681225073. The cubic root of 648940 is about 86.5767970451.

It can be divided in two parts, 6489 and 40, that multiplied together give a triangular number (259560 = T₇₂₀).

The spelling of 648940 in words is "six hundred forty-eight thousand, nine hundred forty".