144640577540 has 24 divisors (see below), whose sum is σ = 303791727960. Its totient is φ = 57847371008.

The previous prime is 144640577537. The next prime is 144640577561. The reversal of 144640577540 is 45775046441.

It can be written as a sum of positive squares in 4 ways, for example, as 12022245316 + 132618332224 = 109646^2 + 364168^2 .

It is a super-2 number, since 2×144640577540² (a number of 23 digits) contains 22 as substring.

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, 419087 + ... + 681846.

It is an arithmetic number, because the mean of its divisors is an integer number (12657988665).

Almost surely, 2^144640577540 is an apocalyptic number.

144640577540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

144640577540 is an abundant number, since it is smaller than the sum of its proper divisors (159151150420).

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

144640577540 is a wasteful number, since it uses less digits than its factorization.

144640577540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107511 (or 1107509 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 47.

The spelling of 144640577540 in words is "one hundred forty-four billion, six hundred forty million, five hundred seventy-seven thousand, five hundred forty".