51078990 has 32 divisors (see below), whose sum is σ = 122836896. Its totient is φ = 13593600.

The previous prime is 51078977. The next prime is 51079027. The reversal of 51078990 is 9987015.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16614 + ... + 19446.

It is an arithmetic number, because the mean of its divisors is an integer number (3838653).

Almost surely, 2^51078990 is an apocalyptic number.

51078990 is an abundant number, since it is smaller than the sum of its proper divisors (71757906).

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

51078990 is a wasteful number, since it uses less digits than its factorization.

51078990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3444.

The product of its (nonzero) digits is 22680, while the sum is 39.

The square root of 51078990 is about 7146.9566949856. The cubic root of 51078990 is about 371.0343349435.

The spelling of 51078990 in words is "fifty-one million, seventy-eight thousand, nine hundred ninety".