70639087 has 4 divisors (see below), whose sum is σ = 70746616. Its totient is φ = 70531560.

The previous prime is 70639057. The next prime is 70639091. The reversal of 70639087 is 78093607.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 70639087 - 2¹⁹ = 70114799 is a prime.

It is a super-2 number, since 2×70639087² = 9979761224387138, 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 (70639027) 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, 52773 + ... + 54094.

It is an arithmetic number, because the mean of its divisors is an integer number (17686654).

Almost surely, 2^70639087 is an apocalyptic number.

70639087 is a deficient number, since it is larger than the sum of its proper divisors (107529).

70639087 is a wasteful number, since it uses less digits than its factorization.

70639087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107528.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 70639087 is about 8404.7062411485. The cubic root of 70639087 is about 413.3789512751.

It can be divided in two parts, 706 and 39087, that added together give a palindrome (39793).

The spelling of 70639087 in words is "seventy million, six hundred thirty-nine thousand, eighty-seven".