74486612781 has 24 divisors (see below), whose sum is σ = 127202100480. Its totient is φ = 41096061216.

The previous prime is 74486612777. The next prime is 74486612801. The reversal of 74486612781 is 18721668447.

74486612781 is a `hidden beast` number, since 7 + 4 + 486 + 61 + 27 + 81 = 666.

It is not a de Polignac number, because 74486612781 - 2² = 74486612777 is a prime.

It is a super-2 number, since 2×74486612781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74486614781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20383125 + ... + 20386778.

It is an arithmetic number, because the mean of its divisors is an integer number (5300087520).

Almost surely, 2^74486612781 is an apocalyptic number.

It is an amenable number.

74486612781 is a deficient number, since it is larger than the sum of its proper divisors (52715487699).

74486612781 is a wasteful number, since it uses less digits than its factorization.

74486612781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40769945 (or 40769942 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 54.

The spelling of 74486612781 in words is "seventy-four billion, four hundred eighty-six million, six hundred twelve thousand, seven hundred eighty-one".