70531290 has 64 divisors (see below), whose sum is σ = 189043200. Its totient is φ = 18712512.

The previous prime is 70531267. The next prime is 70531303. The reversal of 70531290 is 9213507.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63984 + ... + 65076.

It is an arithmetic number, because the mean of its divisors is an integer number (2953800).

Almost surely, 2^70531290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70531290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94521600).

70531290 is an abundant number, since it is smaller than the sum of its proper divisors (118511910).

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

70531290 is a wasteful number, since it uses less digits than its factorization.

70531290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1348 (or 1342 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 70531290 is about 8398.2908975577. The cubic root of 70531290 is about 413.1685687093.

Adding to 70531290 its reverse (9213507), we get a palindrome (79744797).

The spelling of 70531290 in words is "seventy million, five hundred thirty-one thousand, two hundred ninety".