70729681 has 8 divisors (see below), whose sum is σ = 79245504. Its totient is φ = 62561520.

The previous prime is 70729661. The next prime is 70729691. The reversal of 70729681 is 18692707.

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

It is a cyclic number.

It is not a de Polignac number, because 70729681 - 2⁵ = 70729649 is a prime.

It is a super-2 number, since 2×70729681² = 10005375548723522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70729601) 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, 86485 + ... + 87298.

It is an arithmetic number, because the mean of its divisors is an integer number (9905688).

Almost surely, 2^70729681 is an apocalyptic number.

It is an amenable number.

70729681 is a deficient number, since it is larger than the sum of its proper divisors (8515823).

70729681 is a wasteful number, since it uses less digits than its factorization.

70729681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173831.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 70729681 is about 8410.0939947185. The cubic root of 70729681 is about 413.5555940569. Note that the first 4 decimals are identical.

The spelling of 70729681 in words is "seventy million, seven hundred twenty-nine thousand, six hundred eighty-one".