212933778 has 16 divisors (see below), whose sum is σ = 427408320. Its totient is φ = 70721136.

The previous prime is 212933771. The next prime is 212933783. The reversal of 212933778 is 877339212.

It is not an unprimeable number, because it can be changed into a prime (212933771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62398 + ... + 65721.

It is an arithmetic number, because the mean of its divisors is an integer number (26713020).

Almost surely, 2^212933778 is an apocalyptic number.

212933778 is an abundant number, since it is smaller than the sum of its proper divisors (214474542).

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

212933778 is a wasteful number, since it uses less digits than its factorization.

212933778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128401.

The product of its digits is 127008, while the sum is 42.

The square root of 212933778 is about 14592.2506146242. The cubic root of 212933778 is about 597.1473645006.

The spelling of 212933778 in words is "two hundred twelve million, nine hundred thirty-three thousand, seven hundred seventy-eight".