7198771428 has 48 divisors (see below), whose sum is σ = 19015637760. Its totient is φ = 2354313312.

The previous prime is 7198771421. The next prime is 7198771451. The reversal of 7198771428 is 8241778917.

7198771428 is a `hidden beast` number, since 71 + 9 + 87 + 71 + 428 = 666.

It is a super-4 number, since 4×7198771428⁴ (a number of 41 digits) contains 4444 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (7198771421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 623100 + ... + 634547.

It is an arithmetic number, because the mean of its divisors is an integer number (396159120).

Almost surely, 2^7198771428 is an apocalyptic number.

It is an amenable number.

7198771428 is an abundant number, since it is smaller than the sum of its proper divisors (11816866332).

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

7198771428 is a wasteful number, since it uses less digits than its factorization.

7198771428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257713 (or 1257705 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 54.

The square root of 7198771428 is about 84845.5740035979. The cubic root of 7198771428 is about 1930.8689321096.

The spelling of 7198771428 in words is "seven billion, one hundred ninety-eight million, seven hundred seventy-one thousand, four hundred twenty-eight".