54787990375881 has 135 divisors (see below), whose sum is σ = 94600165959117. Its totient is φ = 30553229594160.

The previous prime is 54787990375861. The next prime is 54787990375897. The reversal of 54787990375881 is 18857309978745.

The square root of 54787990375881 is 7401891.

It is a perfect power (a square), and thus also a powerful number.

54787990375881 is a `hidden beast` number, since 5 + 4 + 7 + 87 + 9 + 90 + 375 + 8 + 81 = 666.

It is not a de Polignac number, because 54787990375881 - 2²¹ = 54787988278729 is a prime.

It is a super-2 number, since 2×54787990375881² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 54787990375881.

It is not an unprimeable number, because it can be changed into a prime (54787990375861) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 46787352426 + ... + 46787353596.

Almost surely, 2^{54787990375881} is an apocalyptic number.

54787990375881 is the 7401891-st square number.

54787990375881 is the 3700946-th centered octagonal number.

It is an amenable number.

54787990375881 is a deficient number, since it is larger than the sum of its proper divisors (39812175583236).

54787990375881 is an frugal number, since it uses more digits than its factorization.

54787990375881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2462 (or 1224 counting only the distinct ones).

The product of its (nonzero) digits is 4267468800, while the sum is 81.

The spelling of 54787990375881 in words is "fifty-four trillion, seven hundred eighty-seven billion, nine hundred ninety million, three hundred seventy-five thousand, eight hundred eighty-one".