55400642 has 8 divisors (see below), whose sum is σ = 90655632. Its totient is φ = 25182100.

The previous prime is 55400617. The next prime is 55400651. The reversal of 55400642 is 24600455.

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

It is a super-2 number, since 2×55400642² = 6138462268024328, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1259084 + ... + 1259127.

It is an arithmetic number, because the mean of its divisors is an integer number (11331954).

Almost surely, 2^55400642 is an apocalyptic number.

55400642 is a deficient number, since it is larger than the sum of its proper divisors (35254990).

55400642 is a wasteful number, since it uses less digits than its factorization.

55400642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2518224.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 55400642 is about 7443.1607533359. The cubic root of 55400642 is about 381.2164205129.

The spelling of 55400642 in words is "fifty-five million, four hundred thousand, six hundred forty-two".