55293640 has 32 divisors (see below), whose sum is σ = 124633080. Its totient is φ = 22077952.

The previous prime is 55293619. The next prime is 55293643. The reversal of 55293640 is 4639255.

It can be written as a sum of positive squares in 4 ways, for example, as 54140164 + 1153476 = 7358^2 + 1074^2 .

It is a junction number, because it is equal to n+sod(n) for n = 55293596 and 55293605.

It is not an unprimeable number, because it can be changed into a prime (55293643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33474 + ... + 35086.

Almost surely, 2^55293640 is an apocalyptic number.

It is an amenable number.

55293640 is an abundant number, since it is smaller than the sum of its proper divisors (69339440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55293640 is a wasteful number, since it uses less digits than its factorization.

55293640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2481 (or 2477 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 55293640 is about 7435.9693382907. The cubic root of 55293640 is about 380.9708324495.

The spelling of 55293640 in words is "fifty-five million, two hundred ninety-three thousand, six hundred forty".