55364640 has 48 divisors (see below), whose sum is σ = 174400128. Its totient is φ = 14763776.

The previous prime is 55364629. The next prime is 55364641. The reversal of 55364640 is 4646355.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (55364641) 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, 57192 + ... + 58151.

It is an arithmetic number, because the mean of its divisors is an integer number (3633336).

Almost surely, 2^55364640 is an apocalyptic number.

It is an amenable number.

55364640 is an abundant number, since it is smaller than the sum of its proper divisors (119035488).

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

55364640 is a wasteful number, since it uses less digits than its factorization.

55364640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115361 (or 115353 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 55364640 is about 7440.7418984937. The cubic root of 55364640 is about 381.1338250344.

The spelling of 55364640 in words is "fifty-five million, three hundred sixty-four thousand, six hundred forty".