820372274478 has 32 divisors (see below), whose sum is σ = 1839774736800. Its totient is φ = 270948639168.

The previous prime is 820372274437. The next prime is 820372274507. The reversal of 820372274478 is 874472273028.

820372274478 is a `hidden beast` number, since 82 + 0 + 3 + 7 + 22 + 74 + 478 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

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, 69682551 + ... + 69694322.

It is an arithmetic number, because the mean of its divisors is an integer number (57492960525).

Almost surely, 2^820372274478 is an apocalyptic number.

820372274478 is an abundant number, since it is smaller than the sum of its proper divisors (1019402462322).

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

820372274478 is a wasteful number, since it uses less digits than its factorization.

820372274478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139376993 (or 139376987 counting only the distinct ones).

The product of its (nonzero) digits is 8429568, while the sum is 54.

The spelling of 820372274478 in words is "eight hundred twenty billion, three hundred seventy-two million, two hundred seventy-four thousand, four hundred seventy-eight".