70842639 has 16 divisors (see below), whose sum is σ = 108643328. Its totient is φ = 40221792.

The previous prime is 70842637. The next prime is 70842641. The reversal of 70842639 is 93624807.

It is an interprime number because it is at equal distance from previous prime (70842637) and next prime (70842641).

It is not a de Polignac number, because 70842639 - 2¹ = 70842637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 70842597 and 70842606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70842637) 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, 7447 + ... + 14040.

It is an arithmetic number, because the mean of its divisors is an integer number (6790208).

Almost surely, 2^70842639 is an apocalyptic number.

70842639 is a deficient number, since it is larger than the sum of its proper divisors (37800689).

70842639 is a wasteful number, since it uses less digits than its factorization.

70842639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21654.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 70842639 is about 8416.8069361249. The cubic root of 70842639 is about 413.7756316514.

The spelling of 70842639 in words is "seventy million, eight hundred forty-two thousand, six hundred thirty-nine".