70640587 has 4 divisors (see below), whose sum is σ = 70658896. Its totient is φ = 70622280.

The previous prime is 70640569. The next prime is 70640617. The reversal of 70640587 is 78504607.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78504607 = 53 ⋅1481219.

It is a cyclic number.

It is not a de Polignac number, because 70640587 - 2⁷ = 70640459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70641587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 864 + ... + 11917.

It is an arithmetic number, because the mean of its divisors is an integer number (17664724).

Almost surely, 2^70640587 is an apocalyptic number.

70640587 is a deficient number, since it is larger than the sum of its proper divisors (18309).

70640587 is a wasteful number, since it uses less digits than its factorization.

70640587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18308.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 70640587 is about 8404.7954763932. The cubic root of 70640587 is about 413.3818772474.

The spelling of 70640587 in words is "seventy million, six hundred forty thousand, five hundred eighty-seven".