77424216870 has 256 divisors, whose sum is σ = 252504096768. Its totient is φ = 14671203840.

The previous prime is 77424216851. The next prime is 77424216889. The reversal of 77424216870 is 7861242477.

It is an interprime number because it is at equal distance from previous prime (77424216851) and next prime (77424216889).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2476959 + ... + 2508021.

It is an arithmetic number, because the mean of its divisors is an integer number (986344128).

Almost surely, 2^77424216870 is an apocalyptic number.

77424216870 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 77424216870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126252048384).

77424216870 is an abundant number, since it is smaller than the sum of its proper divisors (175079879898).

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

77424216870 is a wasteful number, since it uses less digits than its factorization.

77424216870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31187.

The product of its (nonzero) digits is 1053696, while the sum is 48.

The spelling of 77424216870 in words is "seventy-seven billion, four hundred twenty-four million, two hundred sixteen thousand, eight hundred seventy".