3728055640 has 48 divisors (see below), whose sum is σ = 8454201840. Its totient is φ = 1479566400.

The previous prime is 3728055623. The next prime is 3728055649. The reversal of 3728055640 is 465508273.

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 = 3728055593 and 3728055602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3728055649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 683725 + ... + 689155.

It is an arithmetic number, because the mean of its divisors is an integer number (176129205).

Almost surely, 2^3728055640 is an apocalyptic number.

It is an amenable number.

3728055640 is an abundant number, since it is smaller than the sum of its proper divisors (4726146200).

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

3728055640 is a wasteful number, since it uses less digits than its factorization.

3728055640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5704 (or 5569 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 40.

The square root of 3728055640 is about 61057.8057253944. The cubic root of 3728055640 is about 1550.5798233088.

The spelling of 3728055640 in words is "three billion, seven hundred twenty-eight million, fifty-five thousand, six hundred forty".