55477990 has 16 divisors (see below), whose sum is σ = 99954000. Its totient is φ = 22170400.

The previous prime is 55477969. The next prime is 55477993. The reversal of 55477990 is 9977455.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 55477990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55477993) 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, 13140 + ... + 16840.

It is an arithmetic number, because the mean of its divisors is an integer number (6247125).

Almost surely, 2^55477990 is an apocalyptic number.

55477990 is a deficient number, since it is larger than the sum of its proper divisors (44476010).

55477990 is a wasteful number, since it uses less digits than its factorization.

55477990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5207.

The product of its (nonzero) digits is 396900, while the sum is 46.

The square root of 55477990 is about 7448.3548519119. The cubic root of 55477990 is about 381.3937506830.

The spelling of 55477990 in words is "fifty-five million, four hundred seventy-seven thousand, nine hundred ninety".