128396770 has 8 divisors (see below), whose sum is σ = 231114204. Its totient is φ = 51358704.

The previous prime is 128396759. The next prime is 128396837. The reversal of 128396770 is 77693821.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 125462401 + 2934369 = 11201^2 + 1713^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6419829 + ... + 6419848.

Almost surely, 2^128396770 is an apocalyptic number.

128396770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128396770 is a deficient number, since it is larger than the sum of its proper divisors (102717434).

128396770 is a wasteful number, since it uses less digits than its factorization.

128396770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12839684.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 128396770 is about 11331.2298538155. The cubic root of 128396770 is about 504.4886108324.

The spelling of 128396770 in words is "one hundred twenty-eight million, three hundred ninety-six thousand, seven hundred seventy".