128861451 has 36 divisors (see below), whose sum is σ = 197042976. Its totient is φ = 81110880.

The previous prime is 128861449. The next prime is 128861461. The reversal of 128861451 is 154168821.

128861451 is a `hidden beast` number, since 128 + 86 + 1 + 451 = 666.

It is not a de Polignac number, because 128861451 - 2¹ = 128861449 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (128861441) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 406345 + ... + 406661.

It is an arithmetic number, because the mean of its divisors is an integer number (5473416).

Almost surely, 2^128861451 is an apocalyptic number.

128861451 is a deficient number, since it is larger than the sum of its proper divisors (68181525).

128861451 is a wasteful number, since it uses less digits than its factorization.

128861451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432 (or 398 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 128861451 is about 11351.7157733974. The cubic root of 128861451 is about 505.0964766825.

The spelling of 128861451 in words is "one hundred twenty-eight million, eight hundred sixty-one thousand, four hundred fifty-one".