1634861970 has 144 divisors (see below), whose sum is σ = 4962536280. Its totient is φ = 372331008.

The previous prime is 1634861951. The next prime is 1634861993. The reversal of 1634861970 is 791684361.

It is a happy number.

1634861970 is a `hidden beast` number, since 1 + 634 + 8 + 6 + 1 + 9 + 7 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1044517761 + 590344209 = 32319^2 + 24297^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1715014 + ... + 1715966.

Almost surely, 2^1634861970 is an apocalyptic number.

1634861970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1634861970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2481268140).

1634861970 is an abundant number, since it is smaller than the sum of its proper divisors (3327674310).

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

1634861970 is a wasteful number, since it uses less digits than its factorization.

1634861970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369 (or 1359 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1634861970 is about 40433.4263945068. The cubic root of 1634861970 is about 1178.0408863719.

The spelling of 1634861970 in words is "one billion, six hundred thirty-four million, eight hundred sixty-one thousand, nine hundred seventy".