51623978 has 8 divisors (see below), whose sum is σ = 88498272. Its totient is φ = 22124556.

The previous prime is 51623953. The next prime is 51623989. The reversal of 51623978 is 87932615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1843700 + ... + 1843727.

It is an arithmetic number, because the mean of its divisors is an integer number (11062284).

Almost surely, 2^51623978 is an apocalyptic number.

51623978 is a deficient number, since it is larger than the sum of its proper divisors (36874294).

51623978 is a wasteful number, since it uses less digits than its factorization.

51623978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3687436.

The product of its digits is 90720, while the sum is 41.

The square root of 51623978 is about 7184.9828113921. The cubic root of 51623978 is about 372.3492548005.

It can be divided in two parts, 5162 and 3978, that multiplied together give a triangular number (20534436 = T₆₄₀₈).

The spelling of 51623978 in words is "fifty-one million, six hundred twenty-three thousand, nine hundred seventy-eight".