1628551404 has 36 divisors (see below), whose sum is σ = 4184107200. Its totient is φ = 533950560.

The previous prime is 1628551399. The next prime is 1628551417. The reversal of 1628551404 is 4041558261.

It is a happy number.

1628551404 is a `hidden beast` number, since 1 + 62 + 8 + 551 + 40 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 368604 + ... + 372995.

It is an arithmetic number, because the mean of its divisors is an integer number (116225200).

Almost surely, 2^1628551404 is an apocalyptic number.

It is an amenable number.

1628551404 is an abundant number, since it is smaller than the sum of its proper divisors (2555555796).

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

1628551404 is a wasteful number, since it uses less digits than its factorization.

1628551404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741670 (or 741665 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 1628551404 is about 40355.3144455597. The cubic root of 1628551404 is about 1176.5231862686.

It can be divided in two parts, 162855 and 1404, that multiplied together give a triangular number (228648420 = T₂₁₃₈₄).

The spelling of 1628551404 in words is "one billion, six hundred twenty-eight million, five hundred fifty-one thousand, four hundred four".