70639942 has 4 divisors (see below), whose sum is σ = 105959916. Its totient is φ = 35319970.

The previous prime is 70639931. The next prime is 70639949. The reversal of 70639942 is 24993607.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24993607 = 19 ⋅1315453.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 70639895 and 70639904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70639949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17659984 + ... + 17659987.

It is an arithmetic number, because the mean of its divisors is an integer number (26489979).

Almost surely, 2^70639942 is an apocalyptic number.

70639942 is a deficient number, since it is larger than the sum of its proper divisors (35319974).

70639942 is a wasteful number, since it uses less digits than its factorization.

70639942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35319973.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 70639942 is about 8404.7571053541. The cubic root of 70639942 is about 413.3806190844.

The spelling of 70639942 in words is "seventy million, six hundred thirty-nine thousand, nine hundred forty-two".