81470702 has 4 divisors (see below), whose sum is σ = 122206056. Its totient is φ = 40735350.

The previous prime is 81470671. The next prime is 81470723. The reversal of 81470702 is 20707418.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20367674 + ... + 20367677.

It is an arithmetic number, because the mean of its divisors is an integer number (30551514).

Almost surely, 2^81470702 is an apocalyptic number.

81470702 is a deficient number, since it is larger than the sum of its proper divisors (40735354).

81470702 is a wasteful number, since it uses less digits than its factorization.

81470702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40735353.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 81470702 is about 9026.1122306340. The cubic root of 81470702 is about 433.5113636660.

The spelling of 81470702 in words is "eighty-one million, four hundred seventy thousand, seven hundred two".