1289520785364 has 48 divisors (see below), whose sum is σ = 3482250240000. Its totient is φ = 363770780256.

The previous prime is 1289520785353. The next prime is 1289520785381. The reversal of 1289520785364 is 4635870259821.

It is a super-2 number, since 2×1289520785364² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1289520785298 and 1289520785307.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97154364 + ... + 97167635.

It is an arithmetic number, because the mean of its divisors is an integer number (72546880000).

It is a 1-persistent number, because it is pandigital, but 2⋅1289520785364 = 2579041570728 is not.

Almost surely, 2^{1289520785364} is an apocalyptic number.

1289520785364 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1289520785364 is an abundant number, since it is smaller than the sum of its proper divisors (2192729454636).

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

1289520785364 is a wasteful number, since it uses less digits than its factorization.

1289520785364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194322092 (or 194322090 counting only the distinct ones).

The product of its (nonzero) digits is 29030400, while the sum is 60.

The spelling of 1289520785364 in words is "one trillion, two hundred eighty-nine billion, five hundred twenty million, seven hundred eighty-five thousand, three hundred sixty-four".