128616761 has 8 divisors (see below), whose sum is σ = 158297664. Its totient is φ = 101762640.

The previous prime is 128616721. The next prime is 128616779. The reversal of 128616761 is 167616821.

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

It is not a de Polignac number, because 128616761 - 2¹⁸ = 128354617 is a prime.

It is a super-2 number, since 2×128616761² = 33084542420262242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128616721) 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, 706595 + ... + 706776.

It is an arithmetic number, because the mean of its divisors is an integer number (19787208).

Almost surely, 2^128616761 is an apocalyptic number.

It is an amenable number.

128616761 is a deficient number, since it is larger than the sum of its proper divisors (29680903).

128616761 is a wasteful number, since it uses less digits than its factorization.

128616761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1413391.

The product of its digits is 24192, while the sum is 38.

The square root of 128616761 is about 11340.9329863111. The cubic root of 128616761 is about 504.7765714235.

The spelling of 128616761 in words is "one hundred twenty-eight million, six hundred sixteen thousand, seven hundred sixty-one".