61212280 has 32 divisors (see below), whose sum is σ = 139991040. Its totient is φ = 24082560.

The previous prime is 61212247. The next prime is 61212287. The reversal of 61212280 is 8221216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61212287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10104 + ... + 14983.

It is an arithmetic number, because the mean of its divisors is an integer number (4374720).

Almost surely, 2^61212280 is an apocalyptic number.

It is an amenable number.

61212280 is an abundant number, since it is smaller than the sum of its proper divisors (78778760).

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

61212280 is a wasteful number, since it uses less digits than its factorization.

61212280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25159 (or 25155 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 61212280 is about 7823.8277077144. The cubic root of 61212280 is about 394.1058233101.

Adding to 61212280 its reverse (8221216), we get a palindrome (69433496).

The spelling of 61212280 in words is "sixty-one million, two hundred twelve thousand, two hundred eighty".