61578355 has 4 divisors (see below), whose sum is σ = 73894032. Its totient is φ = 49262680.

The previous prime is 61578343. The next prime is 61578389. The reversal of 61578355 is 55387516.

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

It is not a de Polignac number, because 61578355 - 2¹⁵ = 61545587 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6157831 + ... + 6157840.

It is an arithmetic number, because the mean of its divisors is an integer number (18473508).

Almost surely, 2^61578355 is an apocalyptic number.

61578355 is a deficient number, since it is larger than the sum of its proper divisors (12315677).

61578355 is a wasteful number, since it uses less digits than its factorization.

61578355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12315676.

The product of its digits is 126000, while the sum is 40.

The square root of 61578355 is about 7847.1877128051. The cubic root of 61578355 is about 394.8899014840.

The spelling of 61578355 in words is "sixty-one million, five hundred seventy-eight thousand, three hundred fifty-five".