1642702644 has 36 divisors (see below), whose sum is σ = 4529878080. Its totient is φ = 497788560.

The previous prime is 1642702631. The next prime is 1642702657. The reversal of 1642702644 is 4462072461.

1642702644 is a `hidden beast` number, since 1 + 6 + 4 + 2 + 7 + 0 + 2 + 644 = 666.

It is an interprime number because it is at equal distance from previous prime (1642702631) and next prime (1642702657).

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 a junction number, because it is equal to n+sod(n) for n = 1642702599 and 1642702608.

It is a congruent number.

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, 2073724 + ... + 2074515.

Almost surely, 2^1642702644 is an apocalyptic number.

It is an amenable number.

1642702644 is an abundant number, since it is smaller than the sum of its proper divisors (2887175436).

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

1642702644 is a wasteful number, since it uses less digits than its factorization.

1642702644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4148260 (or 4148255 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The square root of 1642702644 is about 40530.2682448562. The cubic root of 1642702644 is about 1179.9211486140.

The spelling of 1642702644 in words is "one billion, six hundred forty-two million, seven hundred two thousand, six hundred forty-four".