1642977864 has 64 divisors (see below), whose sum is σ = 4978728000. Its totient is φ = 497871360.

The previous prime is 1642977829. The next prime is 1642977881. The reversal of 1642977864 is 4687792461.

It is a super-3 number, since 3×1642977864³ (a number of 29 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 1642977864.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 343369 + ... + 348120.

It is an arithmetic number, because the mean of its divisors is an integer number (77792625).

Almost surely, 2^1642977864 is an apocalyptic number.

It is an amenable number.

1642977864 is an abundant number, since it is smaller than the sum of its proper divisors (3335750136).

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

1642977864 is a wasteful number, since it uses less digits than its factorization.

1642977864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691515 (or 691505 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The square root of 1642977864 is about 40533.6633429548. The cubic root of 1642977864 is about 1179.9870399802.

The spelling of 1642977864 in words is "one billion, six hundred forty-two million, nine hundred seventy-seven thousand, eight hundred sixty-four".