51398770 has 8 divisors (see below), whose sum is σ = 92517804. Its totient is φ = 20559504.

The previous prime is 51398761. The next prime is 51398771. The reversal of 51398770 is 7789315.

It can be written as a sum of positive squares in 2 ways, for example, as 50168889 + 1229881 = 7083^2 + 1109^2 .

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

It is not an unprimeable number, because it can be changed into a prime (51398771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2569929 + ... + 2569948.

Almost surely, 2^51398770 is an apocalyptic number.

51398770 is a deficient number, since it is larger than the sum of its proper divisors (41119034).

51398770 is a wasteful number, since it uses less digits than its factorization.

51398770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5139884.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 51398770 is about 7169.2935495766. The cubic root of 51398770 is about 371.8070115097.

The spelling of 51398770 in words is "fifty-one million, three hundred ninety-eight thousand, seven hundred seventy".