2865721408 has 42 divisors (see below), whose sum is σ = 6250649678. Its totient is φ = 1302597120.

The previous prime is 2865721403. The next prime is 2865721451. The reversal of 2865721408 is 8041275682.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2126316544 + 739404864 = 46112^2 + 27192^2 .

It is not an unprimeable number, because it can be changed into a prime (2865721403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 177285 + ... + 192772.

Almost surely, 2^2865721408 is an apocalyptic number.

It is an amenable number.

2865721408 is an abundant number, since it is smaller than the sum of its proper divisors (3384928270).

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

2865721408 is a wasteful number, since it uses less digits than its factorization.

2865721408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370091 (or 370070 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 43.

The square root of 2865721408 is about 53532.4332344421. The cubic root of 2865721408 is about 1420.4021554866.

The spelling of 2865721408 in words is "two billion, eight hundred sixty-five million, seven hundred twenty-one thousand, four hundred eight".