77498991 has 24 divisors (see below), whose sum is σ = 118943760. Its totient is φ = 49869792.

The previous prime is 77498989. The next prime is 77499007. The reversal of 77498991 is 19989477.

It is not a de Polignac number, because 77498991 - 2¹ = 77498989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77488991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21001 + ... + 24413.

It is an arithmetic number, because the mean of its divisors is an integer number (4955990).

Almost surely, 2^77498991 is an apocalyptic number.

77498991 is a deficient number, since it is larger than the sum of its proper divisors (41444769).

77498991 is a wasteful number, since it uses less digits than its factorization.

77498991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3480 (or 3445 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 77498991 is about 8803.3511232939. The cubic root of 77498991 is about 426.3490988846.

The spelling of 77498991 in words is "seventy-seven million, four hundred ninety-eight thousand, nine hundred ninety-one".