52215550 has 24 divisors (see below), whose sum is σ = 99493632. Its totient is φ = 20376000.

The previous prime is 52215529. The next prime is 52215607. The reversal of 52215550 is 5551225.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10686 + ... + 14785.

It is an arithmetic number, because the mean of its divisors is an integer number (4145568).

Almost surely, 2^52215550 is an apocalyptic number.

52215550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

52215550 is a deficient number, since it is larger than the sum of its proper divisors (47278082).

52215550 is a wasteful number, since it uses less digits than its factorization.

52215550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25524 (or 25519 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 52215550 is about 7226.0327981542. The cubic root of 52215550 is about 373.7661372659.

Adding to 52215550 its reverse (5551225), we get a palindrome (57766775).

The spelling of 52215550 in words is "fifty-two million, two hundred fifteen thousand, five hundred fifty".