691888148 has 24 divisors (see below), whose sum is σ = 1431494400. Its totient is φ = 286298208.

The previous prime is 691888147. The next prime is 691888259. The reversal of 691888148 is 841888196.

It is a happy number.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 691888148.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691888147) 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, 425228 + ... + 426851.

It is an arithmetic number, because the mean of its divisors is an integer number (59645600).

Almost surely, 2^691888148 is an apocalyptic number.

It is an amenable number.

691888148 is an abundant number, since it is smaller than the sum of its proper divisors (739606252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691888148 is a wasteful number, since it uses less digits than its factorization.

691888148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852119 (or 852117 counting only the distinct ones).

The product of its digits is 884736, while the sum is 53.

The square root of 691888148 is about 26303.7668024943. The cubic root of 691888148 is about 884.4608835222.

The spelling of 691888148 in words is "six hundred ninety-one million, eight hundred eighty-eight thousand, one hundred forty-eight".