70981000 has 32 divisors (see below), whose sum is σ = 166097880. Its totient is φ = 28392000.

The previous prime is 70980991. The next prime is 70981049. The reversal of 70981000 is 18907.

It can be written as a sum of positive squares in 4 ways, for example, as 44169316 + 26811684 = 6646^2 + 5178^2 .

It is a super-2 number, since 2×70981000² = 10076604722000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34491 + ... + 36490.

Almost surely, 2^70981000 is an apocalyptic number.

It is an amenable number.

70981000 is an abundant number, since it is smaller than the sum of its proper divisors (95116880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

70981000 is a wasteful number, since it uses less digits than its factorization.

70981000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71002 (or 70988 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 70981000 is about 8425.0222551635. The cubic root of 70981000 is about 414.0448347750.

Adding to 70981000 its reverse (18907), we get a palindrome (70999907).

The spelling of 70981000 in words is "seventy million, nine hundred eighty-one thousand".