43640506581490 has 128 divisors (see below), whose sum is σ = 100889113973760. Its totient is φ = 13210332208128.

The previous prime is 43640506581439. The next prime is 43640506581491. The reversal of 43640506581490 is 9418560504634.

It is not an unprimeable number, because it can be changed into a prime (43640506581491) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 550775196 + ... + 550854424.

It is an arithmetic number, because the mean of its divisors is an integer number (788196202920).

Almost surely, 2^{43640506581490} is an apocalyptic number.

43640506581490 is an abundant number, since it is smaller than the sum of its proper divisors (57248607392270).

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

43640506581490 is a wasteful number, since it uses less digits than its factorization.

43640506581490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105596.

The product of its (nonzero) digits is 12441600, while the sum is 55.

The spelling of 43640506581490 in words is "forty-three trillion, six hundred forty billion, five hundred six million, five hundred eighty-one thousand, four hundred ninety".