77428142 has 24 divisors (see below), whose sum is σ = 131791296. Its totient is φ = 34056000.

The previous prime is 77428121. The next prime is 77428147. The reversal of 77428142 is 24182477.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77428147) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2342 + ... + 12662.

It is an arithmetic number, because the mean of its divisors is an integer number (5491304).

Almost surely, 2^77428142 is an apocalyptic number.

77428142 is a deficient number, since it is larger than the sum of its proper divisors (54363154).

77428142 is a wasteful number, since it uses less digits than its factorization.

77428142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10376 (or 10365 counting only the distinct ones).

The product of its digits is 25088, while the sum is 35.

The square root of 77428142 is about 8799.3262242060. The cubic root of 77428142 is about 426.2191375504.

The spelling of 77428142 in words is "seventy-seven million, four hundred twenty-eight thousand, one hundred forty-two".