70820581 has 16 divisors (see below), whose sum is σ = 83059200. Its totient is φ = 59790528.

The previous prime is 70820579. The next prime is 70820621. The reversal of 70820581 is 18502807.

It is a cyclic number.

It is not a de Polignac number, because 70820581 - 2¹ = 70820579 is a prime.

It is a super-2 number, since 2×70820581² = 10031109386355122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70820551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2220 + ... + 12106.

It is an arithmetic number, because the mean of its divisors is an integer number (5191200).

Almost surely, 2^70820581 is an apocalyptic number.

It is an amenable number.

70820581 is a deficient number, since it is larger than the sum of its proper divisors (12238619).

70820581 is a wasteful number, since it uses less digits than its factorization.

70820581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9948.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 70820581 is about 8415.4964797093. The cubic root of 70820581 is about 413.7326819512.

The spelling of 70820581 in words is "seventy million, eight hundred twenty thousand, five hundred eighty-one".