128815461 has 16 divisors (see below), whose sum is σ = 191056320. Its totient is φ = 85778640.

The previous prime is 128815457. The next prime is 128815471. The reversal of 128815461 is 164518821.

It is not a de Polignac number, because 128815461 - 2² = 128815457 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128815411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27271 + ... + 31643.

It is an arithmetic number, because the mean of its divisors is an integer number (11941020).

Almost surely, 2^128815461 is an apocalyptic number.

It is an amenable number.

128815461 is a deficient number, since it is larger than the sum of its proper divisors (62240859).

128815461 is a wasteful number, since it uses less digits than its factorization.

128815461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5473 (or 5467 counting only the distinct ones).

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

The square root of 128815461 is about 11349.6899076583. The cubic root of 128815461 is about 505.0363807401.

The spelling of 128815461 in words is "one hundred twenty-eight million, eight hundred fifteen thousand, four hundred sixty-one".