126661640 has 32 divisors (see below), whose sum is σ = 325702080. Its totient is φ = 43426752.

The previous prime is 126661627. The next prime is 126661697. The reversal of 126661640 is 46166621.

It is a junction number, because it is equal to n+sod(n) for n = 126661597 and 126661606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225902 + ... + 226461.

It is an arithmetic number, because the mean of its divisors is an integer number (10178190).

Almost surely, 2^126661640 is an apocalyptic number.

126661640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

126661640 is an abundant number, since it is smaller than the sum of its proper divisors (199040440).

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

126661640 is a wasteful number, since it uses less digits than its factorization.

126661640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452381 (or 452377 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 126661640 is about 11254.4053596803. The cubic root of 126661640 is about 502.2057748056.

The spelling of 126661640 in words is "one hundred twenty-six million, six hundred sixty-one thousand, six hundred forty".