70739981 has 8 divisors (see below), whose sum is σ = 76271160. Its totient is φ = 65221632.

The previous prime is 70739917. The next prime is 70740023. The reversal of 70739981 is 18993707.

It can be written as a sum of positive squares in 4 ways, for example, as 9821956 + 60918025 = 3134^2 + 7805^2 .

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 70739981 - 2⁶ = 70739917 is a prime.

It is a super-2 number, since 2×70739981² = 10008289823760722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70735981) 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, 10421 + ... + 15813.

It is an arithmetic number, because the mean of its divisors is an integer number (9533895).

Almost surely, 2^70739981 is an apocalyptic number.

It is an amenable number.

70739981 is a deficient number, since it is larger than the sum of its proper divisors (5531179).

70739981 is a wasteful number, since it uses less digits than its factorization.

70739981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6415.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 70739981 is about 8410.7063318130. The cubic root of 70739981 is about 413.5756677412.

The spelling of 70739981 in words is "seventy million, seven hundred thirty-nine thousand, nine hundred eighty-one".