53511990 has 128 divisors (see below), whose sum is σ = 154441728. Its totient is φ = 11612160.

The previous prime is 53511979. The next prime is 53512001. The reversal of 53511990 is 9911535.

It is an interprime number because it is at equal distance from previous prime (53511979) and next prime (53512001).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 551622 + ... + 551718.

It is an arithmetic number, because the mean of its divisors is an integer number (1206576).

Almost surely, 2^53511990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53511990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77220864).

53511990 is an abundant number, since it is smaller than the sum of its proper divisors (100929738).

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

53511990 is a wasteful number, since it uses less digits than its factorization.

53511990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222.

The product of its (nonzero) digits is 6075, while the sum is 33.

The square root of 53511990 is about 7315.1889927739. The cubic root of 53511990 is about 376.8342490089.

The spelling of 53511990 in words is "fifty-three million, five hundred eleven thousand, nine hundred ninety".