61347978 has 24 divisors (see below), whose sum is σ = 133806816. Its totient is φ = 20313000.

The previous prime is 61347953. The next prime is 61347983. The reversal of 61347978 is 87974316.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8568 + ... + 14003.

It is an arithmetic number, because the mean of its divisors is an integer number (5575284).

Almost surely, 2^61347978 is an apocalyptic number.

61347978 is an abundant number, since it is smaller than the sum of its proper divisors (72458838).

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

61347978 is a wasteful number, since it uses less digits than its factorization.

61347978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22730 (or 22727 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 61347978 is about 7832.4950047862. The cubic root of 61347978 is about 394.3968319234.

The spelling of 61347978 in words is "sixty-one million, three hundred forty-seven thousand, nine hundred seventy-eight".