61972778 has 8 divisors (see below), whose sum is σ = 106239072. Its totient is φ = 26559756.

The previous prime is 61972777. The next prime is 61972793. The reversal of 61972778 is 87727916.

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 (61972777) 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, 2213300 + ... + 2213327.

It is an arithmetic number, because the mean of its divisors is an integer number (13279884).

Almost surely, 2^61972778 is an apocalyptic number.

61972778 is a deficient number, since it is larger than the sum of its proper divisors (44266294).

61972778 is a wasteful number, since it uses less digits than its factorization.

61972778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4426636.

The product of its digits is 296352, while the sum is 47.

The square root of 61972778 is about 7872.2790855000. The cubic root of 61972778 is about 395.7312268295.

The spelling of 61972778 in words is "sixty-one million, nine hundred seventy-two thousand, seven hundred seventy-eight".