71770145 has 8 divisors (see below), whose sum is σ = 86276904. Its totient is φ = 57314304.

The previous prime is 71770123. The next prime is 71770147. The reversal of 71770145 is 54107717.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6370576 + 65399569 = 2524^2 + 8087^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71770145 - 2¹⁶ = 71704609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71770147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9554 + ... + 15323.

It is an arithmetic number, because the mean of its divisors is an integer number (10784613).

Almost surely, 2^71770145 is an apocalyptic number.

It is an amenable number.

71770145 is a deficient number, since it is larger than the sum of its proper divisors (14506759).

71770145 is a wasteful number, since it uses less digits than its factorization.

71770145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25459.

The product of its (nonzero) digits is 6860, while the sum is 32.

The square root of 71770145 is about 8471.7262113456. The cubic root of 71770145 is about 415.5735911314.

The spelling of 71770145 in words is "seventy-one million, seven hundred seventy thousand, one hundred forty-five".