61878806 has 32 divisors (see below), whose sum is σ = 104544000. Its totient is φ = 27226080.

The previous prime is 61878781. The next prime is 61878811. The reversal of 61878806 is 60887816.

It is a super-4 number, since 4×61878806⁴ (a number of 32 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140735 + ... + 141173.

It is an arithmetic number, because the mean of its divisors is an integer number (3267000).

Almost surely, 2^61878806 is an apocalyptic number.

61878806 is a deficient number, since it is larger than the sum of its proper divisors (42665194).

61878806 is a wasteful number, since it uses less digits than its factorization.

61878806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644.

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 61878806 is about 7866.3082827970. The cubic root of 61878806 is about 395.5311041933.

The spelling of 61878806 in words is "sixty-one million, eight hundred seventy-eight thousand, eight hundred six".