1640574774 has 48 divisors (see below), whose sum is σ = 3747455712. Its totient is φ = 517676544.

The previous prime is 1640574739. The next prime is 1640574787. The reversal of 1640574774 is 4774750461.

1640574774 is a `hidden beast` number, since 1 + 6 + 4 + 0 + 574 + 7 + 74 = 666.

1640574774 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19732 + ... + 60584.

It is an arithmetic number, because the mean of its divisors is an integer number (78071994).

Almost surely, 2^1640574774 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640574774, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1873727856).

1640574774 is an abundant number, since it is smaller than the sum of its proper divisors (2106880938).

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

1640574774 is a wasteful number, since it uses less digits than its factorization.

1640574774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40981 (or 40978 counting only the distinct ones).

The product of its (nonzero) digits is 658560, while the sum is 45.

The square root of 1640574774 is about 40504.0093570995. The cubic root of 1640574774 is about 1179.4114593552.

The spelling of 1640574774 in words is "one billion, six hundred forty million, five hundred seventy-four thousand, seven hundred seventy-four".