55400290 has 32 divisors (see below), whose sum is σ = 110424384. Its totient is φ = 19842240.

The previous prime is 55400287. The next prime is 55400311. The reversal of 55400290 is 9200455.

It is a super-3 number, since 3×55400290³ (a number of 24 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3612 + ... + 11128.

It is an arithmetic number, because the mean of its divisors is an integer number (3450762).

Almost surely, 2^55400290 is an apocalyptic number.

55400290 is a deficient number, since it is larger than the sum of its proper divisors (55024094).

55400290 is a wasteful number, since it uses less digits than its factorization.

55400290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7602.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 55400290 is about 7443.1371074299. The cubic root of 55400290 is about 381.2156131308.

The spelling of 55400290 in words is "fifty-five million, four hundred thousand, two hundred ninety".