71898660 has 72 divisors (see below), whose sum is σ = 229582080. Its totient is φ = 18163008.

The previous prime is 71898653. The next prime is 71898683. The reversal of 71898660 is 6689817.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7092 + ... + 13931.

It is an arithmetic number, because the mean of its divisors is an integer number (3188640).

Almost surely, 2^71898660 is an apocalyptic number.

It is an amenable number.

71898660 is an abundant number, since it is smaller than the sum of its proper divisors (157683420).

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

71898660 is a wasteful number, since it uses less digits than its factorization.

71898660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21057 (or 21052 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 71898660 is about 8479.3077547639. The cubic root of 71898660 is about 415.8214917675.

The spelling of 71898660 in words is "seventy-one million, eight hundred ninety-eight thousand, six hundred sixty".