61551340 has 24 divisors (see below), whose sum is σ = 133716240. Its totient is φ = 23771328.

The previous prime is 61551323. The next prime is 61551401. The reversal of 61551340 is 4315516.

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, 52482 + ... + 53641.

It is an arithmetic number, because the mean of its divisors is an integer number (5571510).

Almost surely, 2^61551340 is an apocalyptic number.

It is an amenable number.

61551340 is an abundant number, since it is smaller than the sum of its proper divisors (72164900).

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

61551340 is a wasteful number, since it uses less digits than its factorization.

61551340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106161 (or 106159 counting only the distinct ones).

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

The square root of 61551340 is about 7845.4662066699. The cubic root of 61551340 is about 394.8321457401.

Adding to 61551340 its reverse (4315516), we get a palindrome (65866856).

The spelling of 61551340 in words is "sixty-one million, five hundred fifty-one thousand, three hundred forty".