80621520 has 160 divisors (see below), whose sum is σ = 293576448. Its totient is φ = 17915904.

The previous prime is 80621501. The next prime is 80621543. The reversal of 80621520 is 2512608.

It is a super-2 number, since 2×80621520² = 12999658974220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 61512 + ... + 62808.

Almost surely, 2^80621520 is an apocalyptic number.

80621520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80621520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146788224).

80621520 is an abundant number, since it is smaller than the sum of its proper divisors (212954928).

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

80621520 is a wasteful number, since it uses less digits than its factorization.

80621520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357 (or 1351 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 80621520 is about 8978.9487135187. The cubic root of 80621520 is about 431.9999142661. Note that the first 4 decimals are identical.

The spelling of 80621520 in words is "eighty million, six hundred twenty-one thousand, five hundred twenty".