68421492 has 18 divisors (see below), whose sum is σ = 172954418. Its totient is φ = 22807152.

The previous prime is 68421467. The next prime is 68421511. The reversal of 68421492 is 29412486.

It can be written as a sum of positive squares in only one way, i.e., 58155876 + 10265616 = 7626^2 + 3204^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1900597 = 68421492 / (6 + 8 + 4 + 2 + 1 + 4 + 9 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 950263 + ... + 950334.

Almost surely, 2^68421492 is an apocalyptic number.

It is an amenable number.

68421492 is an abundant number, since it is smaller than the sum of its proper divisors (104532926).

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

68421492 is a wasteful number, since it uses less digits than its factorization.

68421492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1900607 (or 1900602 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 68421492 is about 8271.7284771685. The cubic root of 68421492 is about 409.0070997068.

The spelling of 68421492 in words is "sixty-eight million, four hundred twenty-one thousand, four hundred ninety-two".