70815945 has 16 divisors (see below), whose sum is σ = 119269440. Its totient is φ = 35780544.

The previous prime is 70815929. The next prime is 70815947. The reversal of 70815945 is 54951807.

It is not a de Polignac number, because 70815945 - 2⁴ = 70815929 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (70815947) 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, 123954 + ... + 124523.

It is an arithmetic number, because the mean of its divisors is an integer number (7454340).

Almost surely, 2^70815945 is an apocalyptic number.

It is an amenable number.

70815945 is a deficient number, since it is larger than the sum of its proper divisors (48453495).

70815945 is a wasteful number, since it uses less digits than its factorization.

70815945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248504.

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 70815945 is about 8415.2210309653. The cubic root of 70815945 is about 413.7236539420.

It can be divided in two parts, 708 and 15945, that added together give a triangular number (16653 = T₁₈₂).

The spelling of 70815945 in words is "seventy million, eight hundred fifteen thousand, nine hundred forty-five".