61345550 has 72 divisors (see below), whose sum is σ = 134942256. Its totient is φ = 20744640.

The previous prime is 61345511. The next prime is 61345573. The reversal of 61345550 is 5554316.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 840314 + ... + 840386.

It is an arithmetic number, because the mean of its divisors is an integer number (1874198).

Almost surely, 2^61345550 is an apocalyptic number.

61345550 is an abundant number, since it is smaller than the sum of its proper divisors (73596706).

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

61345550 is an frugal number, since it uses more digits than its factorization.

61345550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 61345550 is about 7832.3400079414. The cubic root of 61345550 is about 394.3916287737.

Adding to 61345550 its reverse (5554316), we get a palindrome (66899866).

The spelling of 61345550 in words is "sixty-one million, three hundred forty-five thousand, five hundred fifty".