61257755 has 16 divisors (see below), whose sum is σ = 81306624. Its totient is φ = 44012160.

The previous prime is 61257751. The next prime is 61257761. The reversal of 61257755 is 55775216.

It is not a de Polignac number, because 61257755 - 2² = 61257751 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61257751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10331 + ... + 15140.

It is an arithmetic number, because the mean of its divisors is an integer number (5081664).

Almost surely, 2^61257755 is an apocalyptic number.

61257755 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61257755 is a deficient number, since it is larger than the sum of its proper divisors (20048869).

61257755 is a wasteful number, since it uses less digits than its factorization.

61257755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25526.

The product of its digits is 73500, while the sum is 38.

The square root of 61257755 is about 7826.7333543439. The cubic root of 61257755 is about 394.2033937433.

The spelling of 61257755 in words is "sixty-one million, two hundred fifty-seven thousand, seven hundred fifty-five".