801813780 has 36 divisors (see below), whose sum is σ = 2432169012. Its totient is φ = 213816960.

The previous prime is 801813767. The next prime is 801813797. The reversal of 801813780 is 87318108.

It can be written as a sum of positive squares in 2 ways, for example, as 572836356 + 228977424 = 23934^2 + 15132^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2227081 + ... + 2227440.

Almost surely, 2^801813780 is an apocalyptic number.

It is an amenable number.

801813780 is an abundant number, since it is smaller than the sum of its proper divisors (1630355232).

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

801813780 is a wasteful number, since it uses less digits than its factorization.

801813780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4454536 (or 4454531 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 801813780 is about 28316.3164977368. The cubic root of 801813780 is about 929.0188056011.

The spelling of 801813780 in words is "eight hundred one million, eight hundred thirteen thousand, seven hundred eighty".