69128661 has 12 divisors (see below), whose sum is σ = 107220192. Its totient is φ = 39502008.

The previous prime is 69128651. The next prime is 69128687. The reversal of 69128661 is 16682196.

It is not a de Polignac number, because 69128661 - 2⁵ = 69128629 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69128611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 234985 + ... + 235278.

It is an arithmetic number, because the mean of its divisors is an integer number (8935016).

Almost surely, 2^69128661 is an apocalyptic number.

It is an amenable number.

69128661 is a deficient number, since it is larger than the sum of its proper divisors (38091531).

69128661 is a wasteful number, since it uses less digits than its factorization.

69128661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470280 (or 470273 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 69128661 is about 8314.3647382106. The cubic root of 69128661 is about 410.4113678079.

The spelling of 69128661 in words is "sixty-nine million, one hundred twenty-eight thousand, six hundred sixty-one".