61828978 has 4 divisors (see below), whose sum is σ = 92743470. Its totient is φ = 30914488.

The previous prime is 61828931. The next prime is 61828979. The reversal of 61828978 is 87982816.

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., 61826769 + 2209 = 7863^2 + 47^2 .

It is not an unprimeable number, because it can be changed into a prime (61828979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15457243 + ... + 15457246.

Almost surely, 2^61828978 is an apocalyptic number.

61828978 is a deficient number, since it is larger than the sum of its proper divisors (30914492).

61828978 is a wasteful number, since it uses less digits than its factorization.

61828978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30914491.

The product of its digits is 387072, while the sum is 49.

The square root of 61828978 is about 7863.1404667601. The cubic root of 61828978 is about 395.4249083479.

The spelling of 61828978 in words is "sixty-one million, eight hundred twenty-eight thousand, nine hundred seventy-eight".