212078772 has 18 divisors (see below), whose sum is σ = 536088098. Its totient is φ = 70692912.

The previous prime is 212078753. The next prime is 212078803. The reversal of 212078772 is 277870212.

It can be written as a sum of positive squares in only one way, i.e., 120033936 + 92044836 = 10956^2 + 9594^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 5891077 = 212078772 / (2 + 1 + 2 + 0 + 7 + 8 + 7 + 7 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2945503 + ... + 2945574.

Almost surely, 2^212078772 is an apocalyptic number.

It is an amenable number.

212078772 is an abundant number, since it is smaller than the sum of its proper divisors (324009326).

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

212078772 is a wasteful number, since it uses less digits than its factorization.

212078772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5891087 (or 5891082 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 36.

The square root of 212078772 is about 14562.9245689182. The cubic root of 212078772 is about 596.3470382523.

The spelling of 212078772 in words is "two hundred twelve million, seventy-eight thousand, seven hundred seventy-two".