126821280 has 48 divisors (see below), whose sum is σ = 399488544. Its totient is φ = 33818880.

The previous prime is 126821273. The next prime is 126821281. The reversal of 126821280 is 82128621.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (126821281) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 131626 + ... + 132585.

It is an arithmetic number, because the mean of its divisors is an integer number (8322678).

Almost surely, 2^126821280 is an apocalyptic number.

126821280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

126821280 is an abundant number, since it is smaller than the sum of its proper divisors (272667264).

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

126821280 is a wasteful number, since it uses less digits than its factorization.

126821280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264229 (or 264221 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 126821280 is about 11261.4954601953. The cubic root of 126821280 is about 502.4166738891.

The spelling of 126821280 in words is "one hundred twenty-six million, eight hundred twenty-one thousand, two hundred eighty".