71669925 has 36 divisors (see below), whose sum is σ = 131853540. Its totient is φ = 37186560.

The previous prime is 71669891. The next prime is 71669947. The reversal of 71669925 is 52996617.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 199809 + 71470116 = 447^2 + 8454^2 .

It is not a de Polignac number, because 71669925 - 2⁹ = 71669413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4021 + ... + 12629.

Almost surely, 2^71669925 is an apocalyptic number.

71669925 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

71669925 is a deficient number, since it is larger than the sum of its proper divisors (60183615).

71669925 is a wasteful number, since it uses less digits than its factorization.

71669925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8662 (or 8654 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 71669925 is about 8465.8091757374. The cubic root of 71669925 is about 415.3800650420.

The spelling of 71669925 in words is "seventy-one million, six hundred sixty-nine thousand, nine hundred twenty-five".