81764470 has 8 divisors (see below), whose sum is σ = 147176064. Its totient is φ = 32705784.

The previous prime is 81764393. The next prime is 81764479. The reversal of 81764470 is 7446718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81764479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4088214 + ... + 4088233.

It is an arithmetic number, because the mean of its divisors is an integer number (18397008).

Almost surely, 2^81764470 is an apocalyptic number.

81764470 is a deficient number, since it is larger than the sum of its proper divisors (65411594).

81764470 is a wasteful number, since it uses less digits than its factorization.

81764470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8176454.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 81764470 is about 9042.3708174350. The cubic root of 81764470 is about 434.0317920746.

The spelling of 81764470 in words is "eighty-one million, seven hundred sixty-four thousand, four hundred seventy".