126651870 has 128 divisors (see below), whose sum is σ = 366871680. Its totient is φ = 30965760.

The previous prime is 126651857. The next prime is 126651871. The reversal of 126651870 is 78156621.

126651870 is a `hidden beast` number, since 12 + 66 + 518 + 70 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126651871) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 187854 + ... + 188526.

It is an arithmetic number, because the mean of its divisors is an integer number (2866185).

Almost surely, 2^126651870 is an apocalyptic number.

126651870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 126651870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183435840).

126651870 is an abundant number, since it is smaller than the sum of its proper divisors (240219810).

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

126651870 is a wasteful number, since it uses less digits than its factorization.

126651870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747 (or 741 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 126651870 is about 11253.9712990571. The cubic root of 126651870 is about 502.1928619864.

It can be divided in two parts, 12665 and 1870, that added together give a triangular number (14535 = T₁₇₀).

The spelling of 126651870 in words is "one hundred twenty-six million, six hundred fifty-one thousand, eight hundred seventy".