51404665 has 32 divisors (see below), whose sum is σ = 69543936. Its totient is φ = 36218880.

The previous prime is 51404623. The next prime is 51404677. The reversal of 51404665 is 56640415.

It is not a de Polignac number, because 51404665 - 2⁷ = 51404537 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 195324 + ... + 195586.

It is an arithmetic number, because the mean of its divisors is an integer number (2173248).

Almost surely, 2^51404665 is an apocalyptic number.

It is an amenable number.

51404665 is a deficient number, since it is larger than the sum of its proper divisors (18139271).

51404665 is a wasteful number, since it uses less digits than its factorization.

51404665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 51404665 is about 7169.7046661630. The cubic root of 51404665 is about 371.8212253293.

The spelling of 51404665 in words is "fifty-one million, four hundred four thousand, six hundred sixty-five".