55640642 has 8 divisors (see below), whose sum is σ = 84241296. Its totient is φ = 27560212.

The previous prime is 55640617. The next prime is 55640653. The reversal of 55640642 is 24604655.

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

It is a junction number, because it is equal to n+sod(n) for n = 55640599 and 55640608.

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, 129788 + ... + 130215.

It is an arithmetic number, because the mean of its divisors is an integer number (10530162).

Almost surely, 2^55640642 is an apocalyptic number.

55640642 is a deficient number, since it is larger than the sum of its proper divisors (28600654).

55640642 is a wasteful number, since it uses less digits than its factorization.

55640642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260112.

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 55640642 is about 7459.2655134403. The cubic root of 55640642 is about 381.7661141499.

The spelling of 55640642 in words is "fifty-five million, six hundred forty thousand, six hundred forty-two".