55775638 has 8 divisors (see below), whose sum is σ = 83720520. Its totient is φ = 27868800.

The previous prime is 55775611. The next prime is 55775639. The reversal of 55775638 is 83657755.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×55775638² = 6221843588614088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55775639) 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, 5508 + ... + 11911.

It is an arithmetic number, because the mean of its divisors is an integer number (10465065).

Almost surely, 2^55775638 is an apocalyptic number.

55775638 is a deficient number, since it is larger than the sum of its proper divisors (27944882).

55775638 is a wasteful number, since it uses less digits than its factorization.

55775638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19022.

The product of its digits is 882000, while the sum is 46.

The square root of 55775638 is about 7468.3089116613. The cubic root of 55775638 is about 382.0746133139.

The spelling of 55775638 in words is "fifty-five million, seven hundred seventy-five thousand, six hundred thirty-eight".