820012849640 has 64 divisors (see below), whose sum is σ = 1908811170000. Its totient is φ = 316667975680.

The previous prime is 820012849637. The next prime is 820012849693. The reversal of 820012849640 is 46948210028.

It can be written as a sum of positive squares in 8 ways, for example, as 277984126564 + 542028723076 = 527242^2 + 736226^2 .

It is a junction number, because it is equal to n+sod(n) for n = 820012849591 and 820012849600.

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, 19026836 + ... + 19069884.

Almost surely, 2^820012849640 is an apocalyptic number.

It is an amenable number.

820012849640 is an abundant number, since it is smaller than the sum of its proper divisors (1088798320360).

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

820012849640 is a wasteful number, since it uses less digits than its factorization.

820012849640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59510 (or 59506 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 44.

The spelling of 820012849640 in words is "eight hundred twenty billion, twelve million, eight hundred forty-nine thousand, six hundred forty".