261280427940 has 72 divisors (see below), whose sum is σ = 905772154560. Its totient is φ = 59721240384.

The previous prime is 261280427939. The next prime is 261280427977. The reversal of 261280427940 is 49724082162.

261280427940 is a `hidden beast` number, since 2 + 61 + 2 + 80 + 427 + 94 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103681450 + ... + 103683969.

Almost surely, 2^261280427940 is an apocalyptic number.

261280427940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261280427940 is an abundant number, since it is smaller than the sum of its proper divisors (644491726620).

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

261280427940 is a wasteful number, since it uses less digits than its factorization.

261280427940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207365441 (or 207365436 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 261280427940 in words is "two hundred sixty-one billion, two hundred eighty million, four hundred twenty-seven thousand, nine hundred forty".