102440628309 has 4 divisors (see below), whose sum is σ = 136587504416. Its totient is φ = 68293752204.

The previous prime is 102440628289. The next prime is 102440628341. The reversal of 102440628309 is 903826044201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 903826044201 = 3 ⋅301275348067.

It is not a de Polignac number, because 102440628309 - 2¹⁹ = 102440104021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102440628379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17073438049 + ... + 17073438054.

It is an arithmetic number, because the mean of its divisors is an integer number (34146876104).

Almost surely, 2^102440628309 is an apocalyptic number.

It is an amenable number.

102440628309 is a deficient number, since it is larger than the sum of its proper divisors (34146876107).

102440628309 is an equidigital number, since it uses as much as digits as its factorization.

102440628309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34146876106.

The product of its (nonzero) digits is 82944, while the sum is 39.

The spelling of 102440628309 in words is "one hundred two billion, four hundred forty million, six hundred twenty-eight thousand, three hundred nine".