123461272640 has 28 divisors (see below), whose sum is σ = 293992156236. Its totient is φ = 49384508928.

The previous prime is 123461272621. The next prime is 123461272643. The reversal of 123461272640 is 46272164321.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13508018176 + 109953254464 = 116224^2 + 331592^2 .

It is a junction number, because it is equal to n+sod(n) for n = 123461272594 and 123461272603.

It is not an unprimeable number, because it can be changed into a prime (123461272643) 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, 192907919 + ... + 192908558.

Almost surely, 2^123461272640 is an apocalyptic number.

123461272640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123461272640 is an abundant number, since it is smaller than the sum of its proper divisors (170530883596).

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

123461272640 is an equidigital number, since it uses as much as digits as its factorization.

123461272640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385816494 (or 385816484 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 38.

The spelling of 123461272640 in words is "one hundred twenty-three billion, four hundred sixty-one million, two hundred seventy-two thousand, six hundred forty".