128628461 has 8 divisors (see below), whose sum is σ = 145813920. Its totient is φ = 112484592.

The previous prime is 128628433. The next prime is 128628463. The reversal of 128628461 is 164826821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128628461 - 2¹⁸ = 128366317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128628463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260135 + ... + 260628.

It is an arithmetic number, because the mean of its divisors is an integer number (18226740).

Almost surely, 2^128628461 is an apocalyptic number.

It is an amenable number.

128628461 is a deficient number, since it is larger than the sum of its proper divisors (17185459).

128628461 is a wasteful number, since it uses less digits than its factorization.

128628461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520795.

The product of its digits is 36864, while the sum is 38.

The square root of 128628461 is about 11341.4488051571. The cubic root of 128628461 is about 504.7918771187.

The spelling of 128628461 in words is "one hundred twenty-eight million, six hundred twenty-eight thousand, four hundred sixty-one".