7977490428 has 24 divisors (see below), whose sum is σ = 18627048832. Its totient is φ = 2657319984.

The previous prime is 7977490421. The next prime is 7977490441. The reversal of 7977490428 is 8240947797.

It is a happy number.

It is a super-3 number, since 3×7977490428³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7977490421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212350 + ... + 247077.

Almost surely, 2^7977490428 is an apocalyptic number.

It is an amenable number.

7977490428 is an abundant number, since it is smaller than the sum of its proper divisors (10649558404).

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

7977490428 is a wasteful number, since it uses less digits than its factorization.

7977490428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460881 (or 460879 counting only the distinct ones).

The product of its (nonzero) digits is 7112448, while the sum is 57.

The square root of 7977490428 is about 89316.7981289074. The cubic root of 7977490428 is about 1998.1224402696.

The spelling of 7977490428 in words is "seven billion, nine hundred seventy-seven million, four hundred ninety thousand, four hundred twenty-eight".