87777297428 has 24 divisors (see below), whose sum is σ = 160300936320. Its totient is φ = 41977314720.

The previous prime is 87777297427. The next prime is 87777297479. The reversal of 87777297428 is 82479277778.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87777297427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1621178 + ... + 1674446.

It is an arithmetic number, because the mean of its divisors is an integer number (6679205680).

Almost surely, 2^87777297428 is an apocalyptic number.

It is an amenable number.

87777297428 is a deficient number, since it is larger than the sum of its proper divisors (72523638892).

87777297428 is a wasteful number, since it uses less digits than its factorization.

87777297428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71207 (or 71205 counting only the distinct ones).

The product of its digits is 154893312, while the sum is 68.

The spelling of 87777297428 in words is "eighty-seven billion, seven hundred seventy-seven million, two hundred ninety-seven thousand, four hundred twenty-eight".