2178042772 has 6 divisors (see below), whose sum is σ = 3811574858. Its totient is φ = 1089021384.

The previous prime is 2178042743. The next prime is 2178042773. The reversal of 2178042772 is 2772408712.

It can be written as a sum of positive squares in only one way, i.e., 2070796036 + 107246736 = 45506^2 + 10356^2 .

It is a super-2 number, since 2×2178042772² = 9487740633322887968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178042773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272255343 + ... + 272255350.

Almost surely, 2^2178042772 is an apocalyptic number.

It is an amenable number.

2178042772 is a deficient number, since it is larger than the sum of its proper divisors (1633532086).

2178042772 is a wasteful number, since it uses less digits than its factorization.

2178042772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544510697 (or 544510695 counting only the distinct ones).

The product of its (nonzero) digits is 87808, while the sum is 40.

The square root of 2178042772 is about 46669.5058041115. The cubic root of 2178042772 is about 1296.2500954184.

The spelling of 2178042772 in words is "two billion, one hundred seventy-eight million, forty-two thousand, seven hundred seventy-two".