61308878 has 4 divisors (see below), whose sum is σ = 91963320. Its totient is φ = 30654438.

The previous prime is 61308859. The next prime is 61308883. The reversal of 61308878 is 87880316.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15327218 + ... + 15327221.

It is an arithmetic number, because the mean of its divisors is an integer number (22990830).

Almost surely, 2^61308878 is an apocalyptic number.

61308878 is a deficient number, since it is larger than the sum of its proper divisors (30654442).

61308878 is a wasteful number, since it uses less digits than its factorization.

61308878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30654441.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 61308878 is about 7829.9985951467. The cubic root of 61308878 is about 394.3130247958.

The spelling of 61308878 in words is "sixty-one million, three hundred eight thousand, eight hundred seventy-eight".