55621470 has 32 divisors (see below), whose sum is σ = 133816608. Its totient is φ = 14796288.

The previous prime is 55621459. The next prime is 55621477. The reversal of 55621470 is 7412655.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55621477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11682 + ... + 15738.

It is an arithmetic number, because the mean of its divisors is an integer number (4181769).

Almost surely, 2^55621470 is an apocalyptic number.

55621470 is an abundant number, since it is smaller than the sum of its proper divisors (78195138).

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

55621470 is a wasteful number, since it uses less digits than its factorization.

55621470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4524.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 55621470 is about 7457.9802895958. The cubic root of 55621470 is about 381.7222609490.

The spelling of 55621470 in words is "fifty-five million, six hundred twenty-one thousand, four hundred seventy".