2166028738 has 4 divisors (see below), whose sum is σ = 3249043110. Its totient is φ = 1083014368.

The previous prime is 2166028717. The next prime is 2166028759. The reversal of 2166028738 is 8378206612.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2166028717) and next prime (2166028759).

It can be written as a sum of positive squares in only one way, i.e., 1246301809 + 919726929 = 35303^2 + 30327^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2166028694 and 2166028703.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 541507183 + ... + 541507186.

Almost surely, 2^2166028738 is an apocalyptic number.

2166028738 is a deficient number, since it is larger than the sum of its proper divisors (1083014372).

2166028738 is a wasteful number, since it uses less digits than its factorization.

2166028738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083014371.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 2166028738 is about 46540.6138549977. The cubic root of 2166028738 is about 1293.8623378131.

The spelling of 2166028738 in words is "two billion, one hundred sixty-six million, twenty-eight thousand, seven hundred thirty-eight".