61951578 has 32 divisors (see below), whose sum is σ = 137743872. Its totient is φ = 18446400.

The previous prime is 61951577. The next prime is 61951583. The reversal of 61951578 is 87515916.

It is not an unprimeable number, because it can be changed into a prime (61951577) 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, 10393 + ... + 15228.

It is an arithmetic number, because the mean of its divisors is an integer number (4304496).

Almost surely, 2^61951578 is an apocalyptic number.

61951578 is an abundant number, since it is smaller than the sum of its proper divisors (75792294).

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

61951578 is a wasteful number, since it uses less digits than its factorization.

61951578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25670.

The product of its digits is 75600, while the sum is 42.

The square root of 61951578 is about 7870.9324733477. The cubic root of 61951578 is about 395.6860970208.

The spelling of 61951578 in words is "sixty-one million, nine hundred fifty-one thousand, five hundred seventy-eight".