7854178542 has 96 divisors (see below), whose sum is σ = 19313095680. Its totient is φ = 2117283840.

The previous prime is 7854178469. The next prime is 7854178573. The reversal of 7854178542 is 2458714587.

It is a happy number.

It is a super-2 number, since 2×7854178542² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1432867 + ... + 1438337.

It is an arithmetic number, because the mean of its divisors is an integer number (201178080).

Almost surely, 2^7854178542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7854178542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9656547840).

7854178542 is an abundant number, since it is smaller than the sum of its proper divisors (11458917138).

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

7854178542 is a wasteful number, since it uses less digits than its factorization.

7854178542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5766 (or 5759 counting only the distinct ones).

The product of its digits is 2508800, while the sum is 51.

The square root of 7854178542 is about 88623.8034728819. The cubic root of 7854178542 is about 1987.7736219779.

The spelling of 7854178542 in words is "seven billion, eight hundred fifty-four million, one hundred seventy-eight thousand, five hundred forty-two".