61247780 has 36 divisors (see below), whose sum is σ = 141381660. Its totient is φ = 22271040.

The previous prime is 61247777. The next prime is 61247783. The reversal of 61247780 is 8774216.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61247777) and next prime (61247783).

It can be written as a sum of positive squares in 2 ways, for example, as 29528356 + 31719424 = 5434^2 + 5632^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61247780.

It is not an unprimeable number, because it can be changed into a prime (61247783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10235 + ... + 15074.

Almost surely, 2^61247780 is an apocalyptic number.

It is an amenable number.

61247780 is an abundant number, since it is smaller than the sum of its proper divisors (80133880).

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

61247780 is a wasteful number, since it uses less digits than its factorization.

61247780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25340 (or 25327 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 61247780 is about 7826.0960893667. The cubic root of 61247780 is about 394.1819956781.

The spelling of 61247780 in words is "sixty-one million, two hundred forty-seven thousand, seven hundred eighty".