128940722 has 8 divisors (see below), whose sum is σ = 193835676. Its totient is φ = 64328832.

The previous prime is 128940697. The next prime is 128940781. The reversal of 128940722 is 227049821.

It can be written as a sum of positive squares in 2 ways, for example, as 127938721 + 1002001 = 11311^2 + 1001^2 .

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, 69623 + ... + 71450.

Almost surely, 2^128940722 is an apocalyptic number.

128940722 is a deficient number, since it is larger than the sum of its proper divisors (64894954).

128940722 is a wasteful number, since it uses less digits than its factorization.

128940722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141532.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 128940722 is about 11355.2068233036. The cubic root of 128940722 is about 505.2000279385.

The spelling of 128940722 in words is "one hundred twenty-eight million, nine hundred forty thousand, seven hundred twenty-two".