820753534 has 16 divisors (see below), whose sum is σ = 1274818320. Its totient is φ = 395841600.

The previous prime is 820753529. The next prime is 820753547. The reversal of 820753534 is 435357028.

It is a junction number, because it is equal to n+sod(n) for n = 820753493 and 820753502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58834 + ... + 71434.

It is an arithmetic number, because the mean of its divisors is an integer number (79676145).

Almost surely, 2^820753534 is an apocalyptic number.

820753534 is a deficient number, since it is larger than the sum of its proper divisors (454064786).

820753534 is a wasteful number, since it uses less digits than its factorization.

820753534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13755.

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 820753534 is about 28648.7963796038. The cubic root of 820753534 is about 936.2767820204.

The spelling of 820753534 in words is "eight hundred twenty million, seven hundred fifty-three thousand, five hundred thirty-four".