77257221490 has 32 divisors (see below), whose sum is σ = 148196666880. Its totient is φ = 28930359744.

The previous prime is 77257221427. The next prime is 77257221521. The reversal of 77257221490 is 9412275277.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a self number, because there is not a number n which added to its sum of digits gives 77257221490.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3562605 + ... + 3584224.

It is an arithmetic number, because the mean of its divisors is an integer number (4631145840).

Almost surely, 2^77257221490 is an apocalyptic number.

77257221490 is a deficient number, since it is larger than the sum of its proper divisors (70939445390).

77257221490 is a wasteful number, since it uses less digits than its factorization.

77257221490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7146906.

The product of its (nonzero) digits is 493920, while the sum is 46.

The spelling of 77257221490 in words is "seventy-seven billion, two hundred fifty-seven million, two hundred twenty-one thousand, four hundred ninety".