61225778 has 4 divisors (see below), whose sum is σ = 91838670. Its totient is φ = 30612888.

The previous prime is 61225777. The next prime is 61225783. The reversal of 61225778 is 87752216.

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

It can be written as a sum of positive squares in only one way, i.e., 60171049 + 1054729 = 7757^2 + 1027^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61225777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15306443 + ... + 15306446.

Almost surely, 2^61225778 is an apocalyptic number.

61225778 is a deficient number, since it is larger than the sum of its proper divisors (30612892).

61225778 is a wasteful number, since it uses less digits than its factorization.

61225778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30612891.

The product of its digits is 47040, while the sum is 38.

The square root of 61225778 is about 7824.6902814105. The cubic root of 61225778 is about 394.1347894448.

The spelling of 61225778 in words is "sixty-one million, two hundred twenty-five thousand, seven hundred seventy-eight".