70638331 has 4 divisors (see below), whose sum is σ = 70697592. Its totient is φ = 70579072.

The previous prime is 70638329. The next prime is 70638343. The reversal of 70638331 is 13383607.

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

It is a cyclic number.

It is not a de Polignac number, because 70638331 - 2¹ = 70638329 is a prime.

It is a super-2 number, since 2×70638331² = 9979547612931122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 70638293 and 70638302.

It is not an unprimeable number, because it can be changed into a prime (70638361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27805 + ... + 30238.

It is an arithmetic number, because the mean of its divisors is an integer number (17674398).

Almost surely, 2^70638331 is an apocalyptic number.

70638331 is a deficient number, since it is larger than the sum of its proper divisors (59261).

70638331 is a wasteful number, since it uses less digits than its factorization.

70638331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59260.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 70638331 is about 8404.6612662260. The cubic root of 70638331 is about 413.3774765694.

It can be divided in two parts, 70 and 638331, that added together give a square (638401 = 799²).

The spelling of 70638331 in words is "seventy million, six hundred thirty-eight thousand, three hundred thirty-one".