55236990 has 32 divisors (see below), whose sum is σ = 139547520. Its totient is φ = 13954464.

The previous prime is 55236977. The next prime is 55236991. The reversal of 55236990 is 9963255.

It is a super-2 number, since 2×55236990² = 6102250128520200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55236991) 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, 47884 + ... + 49023.

It is an arithmetic number, because the mean of its divisors is an integer number (4360860).

Almost surely, 2^55236990 is an apocalyptic number.

55236990 is an abundant number, since it is smaller than the sum of its proper divisors (84310530).

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

55236990 is a wasteful number, since it uses less digits than its factorization.

55236990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96936.

The product of its (nonzero) digits is 72900, while the sum is 39.

The square root of 55236990 is about 7432.1591748293. The cubic root of 55236990 is about 380.8406826269.

The spelling of 55236990 in words is "fifty-five million, two hundred thirty-six thousand, nine hundred ninety".