1642678542 has 24 divisors (see below), whose sum is σ = 3690957816. Its totient is φ = 547559352.

The previous prime is 1642678537. The next prime is 1642678553. The reversal of 1642678542 is 2458762461.

1642678542 is a `hidden beast` number, since 1 + 6 + 42 + 67 + 8 + 542 = 666.

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, 1689513 + ... + 1690484.

It is an arithmetic number, because the mean of its divisors is an integer number (153789909).

Almost surely, 2^1642678542 is an apocalyptic number.

1642678542 is an abundant number, since it is smaller than the sum of its proper divisors (2048279274).

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

1642678542 is an equidigital number, since it uses as much as digits as its factorization.

1642678542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3380014 (or 3380002 counting only the distinct ones).

The product of its digits is 645120, while the sum is 45.

The square root of 1642678542 is about 40529.9709104263. The cubic root of 1642678542 is about 1179.9153779209.

The spelling of 1642678542 in words is "one billion, six hundred forty-two million, six hundred seventy-eight thousand, five hundred forty-two".