42551320 has 32 divisors (see below), whose sum is σ = 109418400. Its totient is φ = 14588928.

The previous prime is 42551303. The next prime is 42551351. The reversal of 42551320 is 2315524.

It is a super-2 number, since 2×42551320² = 3621229667484800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42551291 and 42551300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75705 + ... + 76264.

It is an arithmetic number, because the mean of its divisors is an integer number (3419325).

Almost surely, 2^42551320 is an apocalyptic number.

42551320 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42551320 is an abundant number, since it is smaller than the sum of its proper divisors (66867080).

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

42551320 is a wasteful number, since it uses less digits than its factorization.

42551320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151987 (or 151983 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 42551320 is about 6523.1372820139. The cubic root of 42551320 is about 349.1170123480.

Adding to 42551320 its reverse (2315524), we get a palindrome (44866844).

The spelling of 42551320 in words is "forty-two million, five hundred fifty-one thousand, three hundred twenty".