1638607796 has 24 divisors (see below), whose sum is σ = 3382934016. Its totient is φ = 679606560.

The previous prime is 1638607787. The next prime is 1638607799. The reversal of 1638607796 is 6977068361.

It is a super-2 number, since 2×1638607796² = 5370071018223955232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638607799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 943031 + ... + 944766.

It is an arithmetic number, because the mean of its divisors is an integer number (140955584).

Almost surely, 2^1638607796 is an apocalyptic number.

It is an amenable number.

1638607796 is an abundant number, since it is smaller than the sum of its proper divisors (1744326220).

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

1638607796 is a wasteful number, since it uses less digits than its factorization.

1638607796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1887839 (or 1887837 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 53.

The square root of 1638607796 is about 40479.7207994324. The cubic root of 1638607796 is about 1178.9399164561.

The spelling of 1638607796 in words is "one billion, six hundred thirty-eight million, six hundred seven thousand, seven hundred ninety-six".