61057407 has 4 divisors (see below), whose sum is σ = 81409880. Its totient is φ = 40704936.

The previous prime is 61057357. The next prime is 61057411. The reversal of 61057407 is 70475016.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61057407 - 2⁶ = 61057343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61057427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10176232 + ... + 10176237.

It is an arithmetic number, because the mean of its divisors is an integer number (20352470).

Almost surely, 2^61057407 is an apocalyptic number.

61057407 is a deficient number, since it is larger than the sum of its proper divisors (20352473).

61057407 is a wasteful number, since it uses less digits than its factorization.

61057407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20352472.

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 61057407 is about 7813.9239182372. The cubic root of 61057407 is about 393.7731672940.

The spelling of 61057407 in words is "sixty-one million, fifty-seven thousand, four hundred seven".