70221655 has 12 divisors (see below), whose sum is σ = 98024040. Its totient is φ = 48151824.

The previous prime is 70221653. The next prime is 70221659. The reversal of 70221655 is 55612207.

It is not a de Polignac number, because 70221655 - 2¹ = 70221653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70221653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143065 + ... + 143554.

It is an arithmetic number, because the mean of its divisors is an integer number (8168670).

Almost surely, 2^70221655 is an apocalyptic number.

70221655 is a deficient number, since it is larger than the sum of its proper divisors (27802385).

70221655 is a wasteful number, since it uses less digits than its factorization.

70221655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286638 (or 286631 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 70221655 is about 8379.8362155832. The cubic root of 70221655 is about 412.5630733060.

It can be divided in two parts, 70221 and 655, that added together give a triangular number (70876 = T₃₇₆).

The spelling of 70221655 in words is "seventy million, two hundred twenty-one thousand, six hundred fifty-five".