76421721810 has 32 divisors (see below), whose sum is σ = 209613866112. Its totient is φ = 17467822080.

The previous prime is 76421721781. The next prime is 76421721821. The reversal of 76421721810 is 1812712467.

It is a super-2 number, since 2×76421721810² (a number of 23 digits) contains 22 as substring.

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, 181956271 + ... + 181956690.

It is an arithmetic number, because the mean of its divisors is an integer number (6550433316).

Almost surely, 2^76421721810 is an apocalyptic number.

76421721810 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

76421721810 is an abundant number, since it is smaller than the sum of its proper divisors (133192144302).

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

76421721810 is a wasteful number, since it uses less digits than its factorization.

76421721810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363912978.

The product of its (nonzero) digits is 37632, while the sum is 39.

The spelling of 76421721810 in words is "seventy-six billion, four hundred twenty-one million, seven hundred twenty-one thousand, eight hundred ten".