70842157 has 4 divisors (see below), whose sum is σ = 73285020. Its totient is φ = 68399296.

The previous prime is 70842119. The next prime is 70842197. The reversal of 70842157 is 75124807.

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: 75124807 = 107 ⋅702101.

It can be written as a sum of positive squares in 2 ways, for example, as 45981961 + 24860196 = 6781^2 + 4986^2 .

It is a cyclic number.

It is not a de Polignac number, because 70842157 - 2¹¹ = 70840109 is a prime.

It is a super-2 number, since 2×70842157² = 10037222416825298, 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 (70842197) 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, 1221388 + ... + 1221445.

It is an arithmetic number, because the mean of its divisors is an integer number (18321255).

Almost surely, 2^70842157 is an apocalyptic number.

It is an amenable number.

70842157 is a deficient number, since it is larger than the sum of its proper divisors (2442863).

70842157 is a wasteful number, since it uses less digits than its factorization.

70842157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2442862.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 70842157 is about 8416.7783028900. The cubic root of 70842157 is about 413.7746932321.

The spelling of 70842157 in words is "seventy million, eight hundred forty-two thousand, one hundred fifty-seven".