215673690 has 16 divisors (see below), whose sum is σ = 517616928. Its totient is φ = 57512976.

The previous prime is 215673673. The next prime is 215673697. The reversal of 215673690 is 96376512.

It is a super-2 number, since 2×215673690² = 93030281116432200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215673697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3594532 + ... + 3594591.

It is an arithmetic number, because the mean of its divisors is an integer number (32351058).

Almost surely, 2^215673690 is an apocalyptic number.

215673690 is an abundant number, since it is smaller than the sum of its proper divisors (301943238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215673690 is a wasteful number, since it uses less digits than its factorization.

215673690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7189133.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 215673690 is about 14685.8329692258. The cubic root of 215673690 is about 599.6977088368.

The spelling of 215673690 in words is "two hundred fifteen million, six hundred seventy-three thousand, six hundred ninety".