77620830 has 64 divisors (see below), whose sum is σ = 214852608. Its totient is φ = 17579520.

The previous prime is 77620819. The next prime is 77620841. The reversal of 77620830 is 3802677.

It is an interprime number because it is at equal distance from previous prime (77620819) and next prime (77620841).

It is a junction number, because it is equal to n+sod(n) for n = 77620791 and 77620800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22095 + ... + 25365.

It is an arithmetic number, because the mean of its divisors is an integer number (3357072).

Almost surely, 2^77620830 is an apocalyptic number.

77620830 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 77620830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107426304).

77620830 is an abundant number, since it is smaller than the sum of its proper divisors (137231778).

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

77620830 is a wasteful number, since it uses less digits than its factorization.

77620830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3401.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 77620830 is about 8810.2684408592. The cubic root of 77620830 is about 426.5724082417.

The spelling of 77620830 in words is "seventy-seven million, six hundred twenty thousand, eight hundred thirty".