55387742 has 16 divisors (see below), whose sum is σ = 85568400. Its totient is φ = 26869248.

The previous prime is 55387727. The next prime is 55387757. The reversal of 55387742 is 24778355.

It is an interprime number because it is at equal distance from previous prime (55387727) and next prime (55387757).

It is a self number, because there is not a number n which added to its sum of digits gives 55387742.

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, 32393 + ... + 34059.

It is an arithmetic number, because the mean of its divisors is an integer number (5348025).

Almost surely, 2^55387742 is an apocalyptic number.

55387742 is a deficient number, since it is larger than the sum of its proper divisors (30180658).

55387742 is a wasteful number, since it uses less digits than its factorization.

55387742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2155.

The product of its digits is 235200, while the sum is 41.

The square root of 55387742 is about 7442.2941355472. The cubic root of 55387742 is about 381.1868295588.

The spelling of 55387742 in words is "fifty-five million, three hundred eighty-seven thousand, seven hundred forty-two".