70816 has 12 divisors (see below), whose sum is σ = 139482. Its totient is φ = 35392.

The previous prime is 70793. The next prime is 70823. The reversal of 70816 is 61807.

70816 is nontrivially palindromic in base 7.

It can be written as a sum of positive squares in only one way, i.e., 38416 + 32400 = 196^2 + 180^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075 + ... + 1138.

2⁷⁰⁸¹⁶ is an apocalyptic number.

It is an amenable number.

70816 is a deficient number, since it is larger than the sum of its proper divisors (68666).

70816 is a wasteful number, since it uses less digits than its factorization.

70816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2223 (or 2215 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 70816 is about 266.1127580557. The cubic root of 70816 is about 41.3723761050.

Subtracting from 70816 its reverse (61807), we obtain a palindrome (9009).

It can be divided in two parts, 7081 and 6, that multiplied together give a triangular number (42486 = T₂₉₁).

The spelling of 70816 in words is "seventy thousand, eight hundred sixteen".