55867640 has 16 divisors (see below), whose sum is σ = 125702280. Its totient is φ = 22347040.

The previous prime is 55867633. The next prime is 55867663. The reversal of 55867640 is 4676855.

It is a congruent number.

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, 698306 + ... + 698385.

Almost surely, 2^55867640 is an apocalyptic number.

It is an amenable number.

55867640 is an abundant number, since it is smaller than the sum of its proper divisors (69834640).

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

55867640 is a wasteful number, since it uses less digits than its factorization.

55867640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396702 (or 1396698 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 41.

The square root of 55867640 is about 7474.4658672042. The cubic root of 55867640 is about 382.2845754644.

The spelling of 55867640 in words is "fifty-five million, eight hundred sixty-seven thousand, six hundred forty".