61212720 has 40 divisors (see below), whose sum is σ = 189760176. Its totient is φ = 16323328.

The previous prime is 61212719. The next prime is 61212743. The reversal of 61212720 is 2721216.

It is a tau number, because it is divible by the number of its divisors (40).

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, 127287 + ... + 127766.

Almost surely, 2^61212720 is an apocalyptic number.

61212720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61212720 is an abundant number, since it is smaller than the sum of its proper divisors (128547456).

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

61212720 is a wasteful number, since it uses less digits than its factorization.

61212720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255069 (or 255063 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 61212720 is about 7823.8558268925. The cubic root of 61212720 is about 394.1067675986.

Adding to 61212720 its reverse (2721216), we get a palindrome (63933936).

The spelling of 61212720 in words is "sixty-one million, two hundred twelve thousand, seven hundred twenty".