70557409 has 12 divisors (see below), whose sum is σ = 78242836. Its totient is φ = 63204192.

The previous prime is 70557391. The next prime is 70557413. The reversal of 70557409 is 90475507.

It can be written as a sum of positive squares in 2 ways, for example, as 37552384 + 33005025 = 6128^2 + 5745^2 .

It is not a de Polignac number, because 70557409 - 2¹³ = 70549217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70557439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 184032 + ... + 184414.

Almost surely, 2^70557409 is an apocalyptic number.

It is an amenable number.

70557409 is a deficient number, since it is larger than the sum of its proper divisors (7685427).

70557409 is an equidigital number, since it uses as much as digits as its factorization.

70557409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816 (or 433 counting only the distinct ones).

The product of its (nonzero) digits is 44100, while the sum is 37.

The square root of 70557409 is about 8399.8457723937. The cubic root of 70557409 is about 413.2195636555.

The spelling of 70557409 in words is "seventy million, five hundred fifty-seven thousand, four hundred nine".