213207778 has 32 divisors (see below), whose sum is σ = 407376000. Its totient is φ = 81471744.

The previous prime is 213207767. The next prime is 213207811. The reversal of 213207778 is 877702312.

213207778 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19053 + ... + 28096.

It is an arithmetic number, because the mean of its divisors is an integer number (12730500).

Almost surely, 2^213207778 is an apocalyptic number.

213207778 is a deficient number, since it is larger than the sum of its proper divisors (194168222).

213207778 is a wasteful number, since it uses less digits than its factorization.

213207778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47194.

The product of its (nonzero) digits is 32928, while the sum is 37.

The square root of 213207778 is about 14601.6361412001. The cubic root of 213207778 is about 597.4033881479.

The spelling of 213207778 in words is "two hundred thirteen million, two hundred seven thousand, seven hundred seventy-eight".