70278561 has 12 divisors (see below), whose sum is σ = 107485092. Its totient is φ = 44096256.

The previous prime is 70278557. The next prime is 70278589. The reversal of 70278561 is 16587207.

70278561 is a `hidden beast` number, since 70 + 27 + 8 + 561 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 43560000 + 26718561 = 6600^2 + 5169^2 .

It is not a de Polignac number, because 70278561 - 2² = 70278557 is a prime.

It is a super-3 number, since 3×70278561³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (70270561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 229516 + ... + 229821.

It is an arithmetic number, because the mean of its divisors is an integer number (8957091).

Almost surely, 2^70278561 is an apocalyptic number.

It is an amenable number.

70278561 is a deficient number, since it is larger than the sum of its proper divisors (37206531).

70278561 is a wasteful number, since it uses less digits than its factorization.

70278561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459360 (or 459357 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 70278561 is about 8383.2309403952. The cubic root of 70278561 is about 412.6744870633.

It can be divided in two parts, 70 and 278561, that added together give a triangular number (278631 = T₇₄₆).

The spelling of 70278561 in words is "seventy million, two hundred seventy-eight thousand, five hundred sixty-one".