61457761 has 4 divisors (see below), whose sum is σ = 64692400. Its totient is φ = 58223124.

The previous prime is 61457749. The next prime is 61457801. The reversal of 61457761 is 16775416.

61457761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61457761 - 2¹⁷ = 61326689 is a prime.

It is the 7840-th Hogben number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61457761.

It is not an unprimeable number, because it can be changed into a prime (61457161) by changing a digit.

It is a nontrivial repunit in base 7839.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1617291 + ... + 1617328.

It is an arithmetic number, because the mean of its divisors is an integer number (16173100).

Almost surely, 2^61457761 is an apocalyptic number.

It is an amenable number.

61457761 is a deficient number, since it is larger than the sum of its proper divisors (3234639).

61457761 is a wasteful number, since it uses less digits than its factorization.

61457761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3234638.

The product of its digits is 35280, while the sum is 37.

The square root of 61457761 is about 7839.5000478347. The cubic root of 61457761 is about 394.6319511399.

The spelling of 61457761 in words is "sixty-one million, four hundred fifty-seven thousand, seven hundred sixty-one".