51401636 has 48 divisors (see below), whose sum is σ = 107213568. Its totient is φ = 21254400.

The previous prime is 51401633. The next prime is 51401639. The reversal of 51401636 is 63610415.

It is an interprime number because it is at equal distance from previous prime (51401633) and next prime (51401639).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (51401633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41141 + ... + 42371.

It is an arithmetic number, because the mean of its divisors is an integer number (2233616).

Almost surely, 2^51401636 is an apocalyptic number.

It is an amenable number.

51401636 is an abundant number, since it is smaller than the sum of its proper divisors (55811932).

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

51401636 is a wasteful number, since it uses less digits than its factorization.

51401636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332 (or 1330 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 51401636 is about 7169.4934270142. The cubic root of 51401636 is about 371.8139220453.

It can be divided in two parts, 5140 and 1636, that added together give a palindrome (6776).

The spelling of 51401636 in words is "fifty-one million, four hundred one thousand, six hundred thirty-six".