202123002078 has 16 divisors (see below), whose sum is σ = 449162226960. Its totient is φ = 67374334008.

The previous prime is 202123002077. The next prime is 202123002091. The reversal of 202123002078 is 870200321202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202123002077) 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, 1871509225 + ... + 1871509332.

It is an arithmetic number, because the mean of its divisors is an integer number (28072639185).

Almost surely, 2^202123002078 is an apocalyptic number.

202123002078 is an abundant number, since it is smaller than the sum of its proper divisors (247039224882).

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

202123002078 is a wasteful number, since it uses less digits than its factorization.

202123002078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3743018568 (or 3743018562 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The spelling of 202123002078 in words is "two hundred two billion, one hundred twenty-three million, two thousand, seventy-eight".