623494420 has 24 divisors (see below), whose sum is σ = 1330805448. Its totient is φ = 245308800.

The previous prime is 623494349. The next prime is 623494427. The reversal of 623494420 is 24494326.

It can be written as a sum of positive squares in 4 ways, for example, as 82373776 + 541120644 = 9076^2 + 23262^2 .

It is a super-2 number, since 2×623494420² = 777490583542272800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623494427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254311 + ... + 256750.

It is an arithmetic number, because the mean of its divisors is an integer number (55450227).

Almost surely, 2^623494420 is an apocalyptic number.

It is an amenable number.

623494420 is an abundant number, since it is smaller than the sum of its proper divisors (707311028).

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

623494420 is a wasteful number, since it uses less digits than its factorization.

623494420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511131 (or 511129 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 623494420 is about 24969.8702439560. The cubic root of 623494420 is about 854.3008865055.

The spelling of 623494420 in words is "six hundred twenty-three million, four hundred ninety-four thousand, four hundred twenty".