61243680 has 48 divisors (see below), whose sum is σ = 192919104. Its totient is φ = 16331520.

The previous prime is 61243661. The next prime is 61243681. The reversal of 61243680 is 8634216.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (61243681) 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, 63316 + ... + 64275.

It is an arithmetic number, because the mean of its divisors is an integer number (4019148).

Almost surely, 2^61243680 is an apocalyptic number.

61243680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61243680 is an abundant number, since it is smaller than the sum of its proper divisors (131675424).

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

61243680 is a wasteful number, since it uses less digits than its factorization.

61243680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127609 (or 127601 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 61243680 is about 7825.8341408440. The cubic root of 61243680 is about 394.1731998097.

Adding to 61243680 its reverse (8634216), we get a palindrome (69877896).

The spelling of 61243680 in words is "sixty-one million, two hundred forty-three thousand, six hundred eighty".