247123271540 has 24 divisors (see below), whose sum is σ = 519633751560. Its totient is φ = 98720759808.

The previous prime is 247123271533. The next prime is 247123271599. The reversal of 247123271540 is 45172321742.

It can be written as a sum of positive squares in 4 ways, for example, as 71726481124 + 175396790416 = 267818^2 + 418804^2 .

It is a super-2 number, since 2×247123271540² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247123271494 and 247123271503.

It is a congruent number.

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, 8018537 + ... + 8049296.

It is an arithmetic number, because the mean of its divisors is an integer number (21651406315).

Almost surely, 2^247123271540 is an apocalyptic number.

247123271540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

247123271540 is an abundant number, since it is smaller than the sum of its proper divisors (272510480020).

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

247123271540 is a wasteful number, since it uses less digits than its factorization.

247123271540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16068611 (or 16068609 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 38.

The spelling of 247123271540 in words is "two hundred forty-seven billion, one hundred twenty-three million, two hundred seventy-one thousand, five hundred forty".