1978028833 has 4 divisors (see below), whose sum is σ = 2157849648. Its totient is φ = 1798208020.

The previous prime is 1978028821. The next prime is 1978028849. The reversal of 1978028833 is 3388208791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1978028833 - 2²⁵ = 1944474401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1978028803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89910391 + ... + 89910412.

It is an arithmetic number, because the mean of its divisors is an integer number (539462412).

Almost surely, 2^1978028833 is an apocalyptic number.

It is an amenable number.

1978028833 is a deficient number, since it is larger than the sum of its proper divisors (179820815).

1978028833 is a wasteful number, since it uses less digits than its factorization.

1978028833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179820814.

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 1978028833 is about 44475.0360651905. The cubic root of 1978028833 is about 1255.2903954910.

The spelling of 1978028833 in words is "one billion, nine hundred seventy-eight million, twenty-eight thousand, eight hundred thirty-three".