234239878557 has 12 divisors (see below), whose sum is σ = 338386309404. Its totient is φ = 156141541440.

The previous prime is 234239878553. The next prime is 234239878571. The reversal of 234239878557 is 755878932432.

234239878557 is a `hidden beast` number, since 2 + 3 + 4 + 2 + 3 + 9 + 8 + 78 + 557 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 152985805956 + 81254072601 = 391134^2 + 285051^2 .

It is not a de Polignac number, because 234239878557 - 2² = 234239878553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 234239878494 and 234239878503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (234239878553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1450518 + ... + 1603895.

It is an arithmetic number, because the mean of its divisors is an integer number (28198859117).

Almost surely, 2^234239878557 is an apocalyptic number.

It is an amenable number.

234239878557 is a deficient number, since it is larger than the sum of its proper divisors (104146430847).

234239878557 is a wasteful number, since it uses less digits than its factorization.

234239878557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3062940 (or 3062937 counting only the distinct ones).

The product of its digits is 101606400, while the sum is 63.

The spelling of 234239878557 in words is "two hundred thirty-four billion, two hundred thirty-nine million, eight hundred seventy-eight thousand, five hundred fifty-seven".