320521977040 has 40 divisors (see below), whose sum is σ = 757430224488. Its totient is φ = 126107005440.

The previous prime is 320521977023. The next prime is 320521977071. The reversal of 320521977040 is 40779125023.

It can be written as a sum of positive squares in 4 ways, for example, as 17876759616 + 302645217424 = 133704^2 + 550132^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 320521976984 and 320521977002.

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, 32835487 + ... + 32845246.

Almost surely, 2^320521977040 is an apocalyptic number.

It is an amenable number.

320521977040 is an abundant number, since it is smaller than the sum of its proper divisors (436908247448).

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

320521977040 is a wasteful number, since it uses less digits than its factorization.

320521977040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65680807 (or 65680801 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 40.

The spelling of 320521977040 in words is "three hundred twenty billion, five hundred twenty-one million, nine hundred seventy-seven thousand, forty".