54739987 has 4 divisors (see below), whose sum is σ = 54769320. Its totient is φ = 54710656.

The previous prime is 54739939. The next prime is 54739991. The reversal of 54739987 is 78993745.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78993745 = 5 ⋅15798749.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54739987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54739187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11662 + ... + 15667.

It is an arithmetic number, because the mean of its divisors is an integer number (13692330).

Almost surely, 2^54739987 is an apocalyptic number.

54739987 is a deficient number, since it is larger than the sum of its proper divisors (29333).

54739987 is a wasteful number, since it uses less digits than its factorization.

54739987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29332.

The product of its digits is 1905120, while the sum is 52.

The square root of 54739987 is about 7398.6476466987. The cubic root of 54739987 is about 379.6950161383.

The spelling of 54739987 in words is "fifty-four million, seven hundred thirty-nine thousand, nine hundred eighty-seven".