51670390 has 16 divisors (see below), whose sum is σ = 94986432. Its totient is φ = 20228224.

The previous prime is 51670387. The next prime is 51670393. The reversal of 51670390 is 9307615.

It is an interprime number because it is at equal distance from previous prime (51670387) and next prime (51670393).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51670393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54499 + ... + 55438.

It is an arithmetic number, because the mean of its divisors is an integer number (5936652).

Almost surely, 2^51670390 is an apocalyptic number.

51670390 is a deficient number, since it is larger than the sum of its proper divisors (43316042).

51670390 is a wasteful number, since it uses less digits than its factorization.

51670390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109991.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 51670390 is about 7188.2118777899. The cubic root of 51670390 is about 372.4608069510.

The spelling of 51670390 in words is "fifty-one million, six hundred seventy thousand, three hundred ninety".