820873542 has 32 divisors (see below), whose sum is σ = 1723684608. Its totient is φ = 260114976.

The previous prime is 820873531. The next prime is 820873589. The reversal of 820873542 is 245378028.

It is a self number, because there is not a number n which added to its sum of digits gives 820873542.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4248 + ... + 40740.

It is an arithmetic number, because the mean of its divisors is an integer number (53865144).

Almost surely, 2^820873542 is an apocalyptic number.

820873542 is an abundant number, since it is smaller than the sum of its proper divisors (902811066).

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

820873542 is a wasteful number, since it uses less digits than its factorization.

820873542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36684.

The product of its (nonzero) digits is 107520, while the sum is 39.

The square root of 820873542 is about 28650.8907714926. The cubic root of 820873542 is about 936.3224129451.

The spelling of 820873542 in words is "eight hundred twenty million, eight hundred seventy-three thousand, five hundred forty-two".