61504778 has 8 divisors (see below), whose sum is σ = 92468640. Its totient is φ = 30681900.

The previous prime is 61504771. The next prime is 61504799. The reversal of 61504778 is 87740516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (61504771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34148 + ... + 35903.

It is an arithmetic number, because the mean of its divisors is an integer number (11558580).

Almost surely, 2^61504778 is an apocalyptic number.

61504778 is a deficient number, since it is larger than the sum of its proper divisors (30963862).

61504778 is a wasteful number, since it uses less digits than its factorization.

61504778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70492.

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

The square root of 61504778 is about 7842.4981989160. The cubic root of 61504778 is about 394.7325605156.

The spelling of 61504778 in words is "sixty-one million, five hundred four thousand, seven hundred seventy-eight".